Actually, I see 9/11 as an example of TLAs refusing to share information when doing that could have easily stopped the hijackers long before they could do anything. I also see it as something the US brought upon itself with its dependence on oil and constant meddling in the Middle East. So I don't think it's a very good analogy for mass shootings by (usually insane, or at least disturbed) white US citizens.
And just because you can't stop all crime doesn't mean you shouldn't stop any crime. There are simple steps that can be taken. For example, the sales of guns at gun shows needs to be stopped immediately. Ex-felons should not be able to get guns. There are a lot of holes in gun control law that could be easily closed if it weren't for people like you making it political suicide for any politician to even suggest that we need stricter gun control laws.
> I think that the better solution is to empower responsible individuals to act in their own self-defense and in the defense of others.
How would you propose to "empower" elementary school children? How about people in a mall or movie theater were the possession of firearms is not allowed?