I can't see any time that laughing at Nazism, homosexuality or the persecution of blacks would be needed.... ....but it happens. Too many of the circle jerkers here has double standards. If people want to be able to make racist and homophobic remarks, why is 9/11 out of bounds?
I'm with Chup on this. There's no good reason to disallow this while keeping the others. I suppose I'm technically also with Clyde.
When do you see me using them? Point them out. Otherwise don't be a shit and lump everyone in the same "you".