Looking at the profiles of all these shooters brings up many common characteristics. Loner, mental illness, violent outbursts and general creepiness. Political ideology is generally non-existent or incoherent, particularly among the mass shooters. Regardless of one’s view on politics or gun control, associating these killers with the Democratic Party (or conversely, with Republicans or Tea Party ideology) is a low blow that’s not backed up by facts, and the argument should be removed from any rational discourse.