A gun is an immediate gratification of that desire, as is picking up a samurai sword. A bomb isn't, indeed the time it takes to sit down and build one might (assuming they have the knowledge in the first place) be time enough for someone to calm down to change their minds if they'd temporarily lost it. I think the reason a lot of these shooters do kill themselves after they've finished or are forced to stop is because it suddenly dawns on them what they've done.
So I'm not really sure it makes sense to compare guns with building a bomb, they are, ultimately, just tools. It's the person who wields it that's the problem.
Trouble is we don't have the ability to read people's minds, so the practical solution would seem to be some sort of regulation.
Edited by ADPT, 14 December 2012 - 06:59 PM.