Grassy, no, you've got me all wrong. I put up some ghastly examples of what I think are not funny 'jokes' because they lack humanity, or empathy with human tragedy. I see how police, the military and emergency services personnel - in fact, anyone connected to the awfulness of the ways we despatch each other and ourselves at times - develop a black humour to deal with what they have to experience through their chosen careers. What I don't get is poking fun at the afflicted. We stopped selling tickets to see the demented of Bedlam a century ago, so why should we sell tickets to shows which provide almost the same sort of 'the mad - aren't they hilarious?' jibes?
I think I've made clear where I draw the line (it's back a page or two). It's when you demean the innocent, the people who can't help being what they are. If you wouldn't sit next to someone with Down's Syndrome and say, "So, seriously, what's life like for mongs like you?" why would you roar with laughter at someone making jibes about their condition?
Of course it's funny to take the **** out of total filth like the Nazis, Pol Pot, Mao, and a host of other pigs who've murdered and maimed millions of innocent lives. They should be parodied and ridiculed as much as we like. Lesser but important targets like the assortment of bigotries we may hold, pomposity, hypocrisy, self-importance, cruelties, vanity - yes, all of those ought to be lampooned. But not people suffering from afflictions they can't possibly help having. That's a line I do draw.
Having said that, there are some comics who've used reverse provocation, like Richard Pryor referring to 'niggers' in his stand-up - because he was a negro and could get away with such a derogatory reference as part of a very satirical act. The point was, of course, to ridicule those who use that word as an insult, throwing it back at them. I'm getting on now so I'm beginning to get used to jokes about 'old women' - there's nothing innately wrong with that, because I'll be old and I am a woman. But to make fun of me because I was crippled, old, and a woman would be unacceptable. (Unless my name was Goebbels, and then all bets would be off!)