That's an awfully random reading of the evidence. How do we know that they were thwarted? Just because they don't happen as often (that we know about)?
I'm not sure what it is we are discussing anymore if I'm being completely honest. It may be because I've been sitting at the courthouse since very early this morning waiting for them to decide if I will serve on a jury which I don't think they are. I think the number of times a mass killing occurs is a good metric to work off of, is it perfect not really, but it's something.
Jury duty is a pain...for some reason ever since I became a lawyer I've never been called :) I guess to me it's just kind of arbitrary. It's like saying we should base policy on the number of killings that happen on Tuesdays.