While he's over the top crazy, there is usually a shred of legitimacy in what he posts.
The left is supposedly the non-violent, "feel good" side of the fence.
The right is supposedly the violent, "losers are losers" side of the fence.
Soccer is supposed to be a non-contact, "one-nil" game.
Football is supposed to be a violent, "stomp their throat when they're down" game.
If you combine those things, you can see why crazies like swamp think soccer is a lefty revolution.
As for me, I'd blame the left for replacing dodgeball with yoga in elementary school. There was nothing like a big rubber ball off the head to make your point when you're 7.