So I guess the sequence is something like this:
Blame it on the TEA Party until evidence develops that he’s a left-winger. At that point, concentrate on his psychiatric issues and build the case that he’s a whack job.
Of course that opens up the issue of “how did he get the guns,” but we all know how we’ll take care of that one.
Why not just blame it on him?
build the case that he’s a whack job.
No building necessary.