If I'm wrong and all we want is to do is to reduce--not eliminate-- mass shootings, then everybody must think there is a certain number of mass shootings over a certain time period that they find acceptable.
Is one mass shooting, or one murder of any sort, "acceptable"? We're into semantics. There will always be murder, so there's nothing we can do to eliminate murder. We should try to reduce the numbers, but at each step, we have to look at costs and benefits.
Why not? If you want to solve a problem it's very helpful to know what rarely causes the problem and what frequently causes the problem. That way we can focus on the most expedient way of achieving our goals. ISF people argue about what an "assault rifle" is and what it isn't but the concept of "rare" isn't contentious.
Well if the concept of "rare" isn't contentious, there's no need to spend time defining it, is there?
I don't know about you, but I don't expect to "solve" any problem of gun violence by talking about it at ISF. I use these discussions to help focus my own thoughts and arguments on issues I find interesting and/or significant. If I happen to persuade someone else, that's a bonus, but people are stubborn, so that rarely happens. When it comes to discussions about what constitutes "rare", I've gotten into such before, and I've seen it happen numerous times from others. They always devolve into meaningless chatter.
Fortunately, there's no need for it, because it isn't contentious anyway.
our goal is to reduce mass shootings in the United States by one.
Correction.
At least one. But you knew that.
Yes. Obviously, that's the most likely scenario.
This, on the other hand, is a contentious issue. In some cases, the most likely scenario is no mass shooting at all. It varies with the psychology of the individual shooter.
OK, this should be good. Explain why the most sensible way to reduce mass shootings is to ban the type of gun mass shooters don't use very often while leaving the mass shooter's weapon of choice legal.
Each mass shooter chooses a different weapon. For those who choose an assault rifle, they would have to make a different choice, either in the weapon, or in how to obtain the weapon. In some cases, deprived of his weapon of choice, he will choose to not commit the mass shooting at all. Also, you might be just simplifying my words, but you frequently refer to "reducing mass shootings", whereas I frequently refer to "reducing deaths in mass shootings." In this case, the distinction is significant.
You seem to have great insight into the mind of the mass shooter.
My knowledge of the subject is limited to reading about individual articles describing perpetrators and their motives and behavior that are published about specific mass shooters, or an occasional magazine article (mostly web-published) discussing the subject. I cannot claim to have researched the area thoroughly or perused academic research on it. Nevertheless, I feel at least somewhat confident in my insights, and I don't feel compelled to do the sort of research that might be able to bolster my opinions.
To be perfectly honest, if I did so, I think you would dismiss that research anyway, so there's not a lot of point to doing it. However, I will make you a promise that if you were to present some better documented findings that contradict my insights, I would read it, consider it, and comment upon it.
They are the ONLY type of gun used in about half the mass shootings in the United States, including the 2007 Viriginia Tech shooting that killed 32 people. Even Adam Lanza with his mommy's manly arsenal of "assault rifles" could only manage 26.
I've been using the term "assault rifle", but that's less accurate than the other term I sometimes use, which is "guns that can fire lots of bullets very fast." Is that what Cho used? I think he had lots of magazines, which could hold a lot of bullets, and be changed rapidly. Seems like a bad idea. Maybe those should be banned. I'll leave the specific details to legislative staffs.
Why not try to reduce mass shootings by more than one and go after the most dangerous weapons?
Again with the same question. The constitution prohibits a ban on all guns. It's a non-starter.
There might be other reasons as well, but because of the constitutional restriction, such a proposal isn't even on the table. It's not part of the discussion except by real fringe players (like one retired Supreme Court justice.)
But I will reluctantly concede your point: effectively disarming America might result in one less mass shooting. But that's not a sure thing. If it did, is it worth the effort to ban or restrict something that millions of Americans of use without causing any problems to stop the one person who does?
You're getting into straw territory here. Banning assault weapons would not "effectively disarm" America. None of the proposals being seriously considered in the wake of the Parkland murders would effectively disarm America.
Do "millions of Americans" actually use assault weapons?
When it comes to the actual number of Americans affected, and the actual manner in which they are affected, and the possibility that there would be considerably more than one mass shooting prevented, is it worth it? I think so.