In the past few months there have been two mentally ill people who have gone on rampages, and both were part of far right movements. Is this an inherent part of conservative ideology? Absolutely not, that's as ridiculous as blaming this on gaming.
However it would be nice to see groups like the Tea Party and the Progress Party tone down their rhetoric and acknowledge that whipping their followers into a frothing rage may have affected Jared Lee Loughner and Anders Behring Breivik. Again, I don't believe their ideology made these people mentally ill, but I do think their actions are influential, and problematically so. I think members of these groups, and groups like them, should tone down the rampant hostility they've been using to feed their movement.
A mentally ill person could latch onto anything and have it influence horrible actions, I wouldn't want these individuals to play Manhunt either. Gaming has restrictions to prevent children from getting a hold of violent video games, there is nothing stopping these political activists (and in fact quite a number are extremely proud about involving their children in very hateful rallies). I am not asking for any legislative restriction, but I think these groups should consider what affect they are having.
It is of course terribly ironic that many of the people blaming computer games belong to, or are similarly inclined, to these hostile groups on the far right.