He was also a tea bagger and white supremacist. He also hated gay people and loved Hitler.

Lafayette Shooter Was Teabaggin?, Gay-Hatin?, Hitler-Lovin? Fool, THANKS OBAMA! | Wonkette

I think he was just seriously off his rocker.

From the article:
"Just remember, that’s the only important part. Not guns, not radical ideologies that incite people to violence. He was a disturbed, lonely man, and it will always be Too Soon to talk about any other issues that led to this tragic event."