People prone to violent behaviour and 'massacres' are going to do such things
whether they play games of whatever kind or not. Real difference in the US is
the easy access to weapons combined with (I suspect) the greater degree of
potential alienation & lack of support some people feel at key points in their life,
especially when they're young (peer pressure, political correctness, dislike by
others of alternative dress styles such as goth, etc.)
When it comes to games, the only downside of basing games on real-life data
I can see is that a lot of real-life places are kinda boring, whereas created
environments can be anything one cares to imagine. I understand the cost
saving argument, but would that really lead to cheaper game prices? I highly
doubt it, though if the saved were used to improve the 3D engine and do
more debugging before launch then that'd be a positive.
Ian.