Story time here:
In high school we had a motivational speaker who had once been rich, bought fast cars and hard drugs, and seriously screwed up his life. Half his body had been paralyzed in a car accident, and he spoke about how before drugs he had loved running. To demonstrate how drugs had ruined his life, he tried running across the stage. The intention was to garner shock and sympathy, but instead everyone laughed. I chuckled(whaddya expect, I was a jerk teenager), but felt a huge amount of shame. That shame comes back every time I watch Tom Green.
It's like laughing at the 'special' children in a playground. You may think it's funny, but your going to hell for laughing.