You speak as though there is a class of people called "law-abiding citizens" and a class of people called "criminals." It doesn't work like that.
Actually, it does.
Criminal: Defined as breaking the law.
Law-Abiding Citizen: Does not break the law, as he abides by it.
Quid pro quo.
Now, I'll grant you that there's ways of turning someone into a criminal in ways that are wrong. (I.E., by making it illegal for them to possess the firearms that they have)
However, someone that kills someone else has commited a crime worthy of making them a criminal, whether it's a crime of passion or not. And you can bet that they would be just as likely to harm another without a gun as much as with.
The people in whose hands guns are most dangerous ARE the law-abiding citizens. Guns are used against family members, guns are used drunkenly and guns are used in anger. The average gun death is an act of passion. It is an act with little to no forethought. It is an accident. It is a heated exchange between people who know each other.
And many use axes, knives, and other objects to kill. That's not as mentioned. Why? Because it's not with a gun.
Fact: People are more likely to fall into a blind rage ("I see red") when using a knife than a gun.
And about half of all gun deaths are suicides by "law-abiding citizens."
And, as mentioned above (which you seem to have so conveniently ignored, as so many gun control advocates seem to do), there are other nifty ways to commit suicide.
Personally, I don't feel the urge to save everyone that wants to commit suicide, though. If they really want to die, then who am I to put a stop to it? I consider someone committing suicide to be "less than" someone raping or killing another person against their will.
Guns turn "law-abiding citizens" into criminals.
Or law abiding citizens become criminals through their actions, actions with which were not induced upon them by firearms. Guns are a tool, like anything else.
As mentioned before, there are societies where people have guns and gun crimes rates are pretty low. Therefore, guns do not create the criminals, criminals use the guns.
It gives the average person too much access to too much power.
Your definition of "too much power" does not fit mine. That is a matter of opinion, a subjective matter.
And the proof is in the papers every single day.
What proof? Seriously, what proof?
"In the papers"? Oh, yes, the lovely reporters! The guys that report gun deaths over axe or knife deaths all the time!
You'll have to do better than that if your only "proof" is to use the mass media.
Now, please, SOME gun control advocate answer this question:
HOW DO YOU REMOVE GUNS FROM AMERICA? EACH AND EVERY ONE OF THEM? IN WAYS THAT THEY WILL NOT FALL INTO THE HANDS OF STREET CRIMINALS?
Until you can answer that very very basic question, then you have no case.