The killer was a registered Democrat; therefore all Democrats are potential killers.
The killer was a registered Democrat who shot and killed a bunch of gays; therefore Democrats hate gays.
The killer was a registered Democrat who shot and killed many latinos; therefore Democrats are racist and hate latinos.
See, Democrats are evil racist homophobic killers.
Snopes tried to downplay his Democrat registration (that was in 2006, he may have changed).
the American Thinker post indicated he voted in 2008,2012, and 2014. Any primaries?