Loughner was a registered Independent. The Ft Hood shooter's political affiliation is unknown (and likely irrelevant). The Virgina Tech shooter wasn't a citizen, so you just made that part up. The Colorado theater shooter wasn't registered to vote. The Newtown shooter's mother was a Republican, but we don't know what her son's party was, if any. I understand how confusing it can get when you're looking for any opportunity to smear an entire group you don't like. Mistakes happen.

Now, if you can bear to separate party affiliation from political leaning, we could recount the number of acts of mass violence that were fueled by intolerance, hatred, fear of black presidents, or opposition to any form of central government. Would you like to play that game?