Metal detectors everywhere? Who wants to live like that? And cops at every public place is simply not possible. I'll take my chances. Let's not blow these incidents out of proportion. The US has a population of over 300 million. I don't have to worry about getting shot tonight if I go out. The odds just aren't there.
It's a tragedy, as it is anytime innocent people get hurt. It's not something to fear. I have a better chance of getting hit by a plane than I do of getting gunned down at the movies.