Its not humanity that said laughing at bad things happening was bad, but society. Laughing when being tickled isnt reacting because its pleasant, but because its uncomfortable. There were many stories and tales of people making a mockery or joke of death or other serious things. Not laughing at the particular person, but the situation as a whole. Hamlet was one of the famous examples. The gravekeeper holding the skull and delivering his speech was a comedic break. Even the vikings said "I will look death in the eye and laugh." Its like how a lot of people will say dont cry at my funeral, laugh and remember the good times despite it being against the norm. It is society that says you need to cry and mourn the dead. But the Greeks took a week to mourn and party in honor of the dead. Someone getting hurt or killed is a bad thing, but why when someone get hurt or dies comically we can laugh?
"A train accident: Train hits clown car, 50 dead."
I believe if something is funny, albeit tragic, then laugh. But understand there is a line between funny and inappropriate. I made the joke at work about the moments before he fell he had to take a phone call. We laughed. On the other hand, I wont make a 9/11 joke, because there was no real humor in that situation, except for the plane that was crashed in the field, cause it seemed those hijackers failed Hijacking 101. The best way to gauge if something bad is funny is the reaction of the person or peoples involved.
like this was funny:
My cousin who was a bit too deep into the herb fell down his apartments third floor stairs. Rolled under the second floor's landing rail, fell past the ground floor hit the stairs leading to the basement storage rooms and rolled into an open dumpster. He called me from the hospital three states away to ask me to get his phone and keys.
Another example is the Darwin Awards.