I had an idea that it was Carlin but wasn't sure and couldn't be bothered googling it. So I decided to google it and still couldn't find out who said it. I did find some really good ones though. This one is from Carlin:
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done."
From here. I also found this
site, which has some rather good stuff if you know anyone who is into those bloody motivational posters.
Devious, treacherous, murderous, neanderthal, sub-human of the West.