The other thing is, there isn't a whole lot of contact in soccer/football. Don't get me wrong, it's a physical sport, but a getting slide tackled isn't like getting hit in american football, rugby, or hockey. As a player of both soccer and hockey, I get much more angry if I get leveled into the boards then I do if I get tripped in a soccer game.
Hockey:
http://video.google.com/videoplay?docid=-8...10&q=hockey+hit
Soccer/Football:
Honostly, I couldn't even find a video of someone getting hit hard in a football match.