It could be they're the same person, perhaps one who has an occassional bad day. On the other hand, it could also be a case in impersonation to make him look bad. You might want to check the TCP/IP address at the top of each post to find out. Of course, he could have more than one IP address so the idea isn't foolproof.

There's also the possibility that he, like some others I know, are refusing to accept the names that have been dumped on us for years (bigot, racist, homophobe, Nazi, to name just a few) and is deciding to fight back. I can't speak for him but fully understand if that's the case. Quite frankly, I've been called those names and worse by liberals and I refuse to accept that kind of crap from anyone.

If someone called me any of those names to my face, they'd be asking for a fight. However, the more common tactic is to hide behind the Internet while lying about and slandering others while they would never have the balls to say those things to someone's face.