Well, I'm Canadian so I can't speak with certainty on how laws are 'dictated' in the states, but here we vote in our politicians, and so the laws they 'dictate' are a consequence of having the majority of the populace choose their leaders. You may be more informed, but I don't believe that the vast majority of Americans are insane. Maybe what you meant was more like this:
There's something to be said in favor of not letting... the politicians you voted into office to overreact to tragic events and allow insane people to indirectly dictate the laws that the rest of us have to follow.
Don't like your laws? Blame your politicians, and vote them out in the next election. The 'Insane People Dictating Laws' lobby can't have that many supporters, could they?
But I guess that's pre-9/11, pre-Sandy Hook, pre-Dunblane, pre-Oklahoma City thinking, huh.
I think the vast majority of sane people realize that it's normal for world/societal views to change after major events. It's a strange view to take that things should just be a shrug of the shoulders and a 'business as usual' attitude... but that may explain some things in itself.