I've already said many times I think this guy was nuts and he could have just as easily shot up his school.
I don't think that the phrase " brought us to this time of domestic terrorism" means he suggesting direct cause and effect.
I certainly don't think Palin caused this with her stupid and constant gun imagery just like I don't think Olberman caused this with his comments. I do think that violent rhetoric by people in the media (pundit's, politicians, etc..) is irresponsible and could potentially contribute to violent acts by crazy people but I don't think that's the case with Lougher (though at this point we don't know it's not either)
just in case you're still confused - the above in my opinion.