Livelsberger left behind two messages that were critical of Democrats and American culture. Little else has been confirmed about the decorated war veteran.
I guess he figured he'd get more attention for his manifesto if he blew himself up using basically the 2 just talked about symbols. Unfortunately for him, someone else decided to do something similar in New Orleans and killed more people.
Probably because conservatism comes from fear and hate, and those are pretty violent emotions. Someone with a lot of empathy, that sees other people as whole humans, is less likely to be right-wing and also less likely to do violence + terrorism.