Same thing like diving. Last WC, Australia vs Italy, Lucas Neill slide toward Grosso, Grosso see the man on the ground and say ay.. look ah easy penalty, make sure it had contact, fall down. Penalty score, Italy is WC champions right now.
So if yuh vex with Henry (and rightfully so) you have to be vex with the divers and fakers in general (C. Ronaldo!). If the culture of football is to see what you could get away with and who you could fool, then you can't expect that players wouldn't take advantage. Play to the whistle, ref will sort it out on the field, God will sort it out in the afterlife.