Firefox31780: I would think psychological problems would be the root cause of mass shootings rather than the shadow of masculinity.
Vainamoinen: I would think that living by a regressive and outdated concept of masculinity – one that makes you pop at a moment's notice just like that guy up there – qualifies as a doozy of a "psychological problem" in its own right, and pinpointing the specific nature of that affliction helps us narrow down the actual root cause of these shootings. After all, these men (and it's always men) are living utterly senseless lives by an entirely disfunctional and screwed code of honor; that's a hell of a reason to pop, wouldn't you agree?
Yet while we're still generalizing, I honestly don't see how people can buy and own functional weapons of mass killing and not have a horrifying truckload of psychological problems already.
Projecting your belief that the concept of masculinity is a "doozy of a 'psychological prblem'" doesn't make it one. Again, you overlook the known psychological issues of the shooters. For example, suffering from a combination of severe anxiety, mutism, and major depressive order (as the Virginia Tech shooter had) can lead someone to "pop", not masculinity.
People collect guns because they are interested them in, just as people collect cars, stamps, insects, and video games. Cars and other vehicles can be used as a weapon of mass killing, as has been demonstrated in Europe. Do car collectors have a "horrifying truckload of psychological problems"?