my personal take on this is, its some rightwinger trying to get the troubles to pop off.
yeah...don't do this.
speculating without evidence about the identity/motivation of shooters is bad. it's bad when right-wingers do it and it's bad when people on the left do it.
just wait. wait for actual reliable evidence to come out. there's no prize for saying 5 minutes after the shooting "I bet it was someone who thought X" and having that turn out to be correct.