Careful, you are beginning to reproduce the same arguments invariably voiced by the NRA

... OK, well maybe think about this (apologies for such a big mass of stuff, below ... ) -
- whenever these shooting cases arise, the NRA and pro-gun supporters almost always say that guns are not the problem and that legal owners are responsible people etc., and that the actual problem is illegally owned guns and a failure to check the mental health of certain gun owners. OK, afaik claims like that are totally untrue. Here is an article from NBC News in 2015 after a shooting in San Bernardino -
https://www.nbcnews.com/storyline/s...-used-mass-shootings-obtained-legally-n474441
The article says that going back 30 years over all the past “mass shootings” (see quote below for what “mass" shooting means) 82% of the guns used were legally owned -
" Eighty-two percent of weapons involved in mass shootings over the last three decades have been bought legally, according to a database compiled by Mother Jones magazine that defines a mass shooting as taking the lives of at least four people in a public place. Using that criteria, Mother Jones found 73 mass shootings since 1982."
And as if that 82% figure were not high enough, keep in mind that is a figure only for mass/spree shootings, though every year in the US the totality of the 10,000 or more gun deaths are situations where a gun owner has lost his temper inside the family home and just picked up one of his guns ans shot one or more members of the family, or just taken the gun across the road to shoot at an annoying neighbour, or gone to his workplace to shoot a workmate etc., … and it should be obvious that almost all cases like that (which are the vast majority of US shooting, i.e. as opposed to just 30 or 40 mass/spree shootings per year) are likely to be almost certainly where the guy legally owns the guns and he's just lost his temper (or been drunk etc.) and finally shot at someone in the home or effectively very close by … that's much more likely to involve legally owned guns than the case of planned mass/spree shooting at schools & elsewhere, where the shooter has invariably been planing the massacre for many months and may be determined to obtain guns specially for that life-changing event regardless of whether he has to obtained certain weapons illegally for that … so IOW that figure of 82% legal ownership, is if anything, likely to be even higher for almost all of the other 10,000+ shooting deaths per year in the US.
On top of which - in the present case of the Florida shooting, it has been widely reported that Cruz did in fact have legal use and license for those guns.
So unless someone has got very different (and genuine figures, not NRA invented lies) then imho the idea that illegal or unlicensed guns are a significant part of the problem appears to be an overt outright lie put around by groups like the NRA.
Finally, on that point, just for reference re. the number of gun deaths in the US, here is a short clear summary from the BBC in 2016 -
http://www.bbc.co.uk/news/world-us-canada-34996604
Unfortunately I think several UK posters here may have seriously mislead you about how many UK homes have any such guns.
Right back near the start of this thread, I explained that after living all my 50+ years of life in London (which is a very big modern city with 8 to 10 million inhabitants), I had never known even one single person who had ever kept a gun in their house. Nor had I never met anyone who even claimed ever to have kept a gun, never met anyone who had ever known anyone else who had kept a gun, and never met anyone at all who ever even mentioned for 1 second any interest in any guns etc. Nothing. Zilch. And of course for about 35-40 years now, I've been an avid reader of the mature UK broadsheet press, and listened almost every day for many hours the BBC radio news in the UK and around the world (especially politics and current affairs) … and in all that time I can tell you there are almost never reports of any ordinary people keeping guns in their homes (the only time guns are in the UK news is when in certain rough areas of inner-cities, some gangland drug dealers (almost entirely black guys of West Indian origin who try to copy the drug-related gun violence from Jamaica and parts of the US, and where they have obtained what are usually very old pistols and often re-converted versions, which the gang leaders then use to threaten or shoot rival gang leaders in drug “turf wars”).
The most notable example of that in recent years was the case of guy called Mark Duggan, and you can read about that in the link below …
https://en.wikipedia.org/wiki/Death_of_Mark_Duggan
But apart from that, and apart from UK armed police now having to respond more often to acts of Islamic fundamentalist terrorism (several lethal cases last year), those are literally the only times you will ever read about or hear about or see news film of anything whatsoever about anyone in the UK owning guns or having any connection with any guns whatsoever.
Well a baseball bat is very VERY far from being as lethal as a gun! That's just not a comparison at all.
Again, that's the sort of thing that we hear from the NRA and it's supporters who say
“oh, well you could kill people with a kitchen knife or a brick, and we are not banning those, so equally we cannot ban guns and bullets .. case solved - we all keep our guns!”
Suppose the US bans automatic and semi-auto rifles. Do you really think that will have any noticeable reduction on the number of fatal US shooting incidents? I don't think it will. Anyone who sets out like Cruz to shoot at a school, or anyone who decides to shoot a member of the family, a neighbour, or a workmate because of some dispute, or anyone who shoots people in a drunken fit of anger or stupidity etc., can and will do that just as easily with any of many dozens of different high-power handguns or other types of rifles etc. … people like Cruz who plan for months to carry out a mass school shooting, will not give up the idea simply because they can no loner get an official license to buy an AR15 (to think that would deter them is crazy) … and people who shoot a family member, neighbour, workmate or anyone will do that just as easily and just as deadly with any sort of of loaded guns that they keep in the house (banning people from legally owning an AR15 will make not one iota of difference in the total overall figures).