Instead of violence, he should have demanded the comedian retract the 'joke' immediately and be escorted off the premises. The whole proceedings should have been drawn to a halt while the thing was sorted. Many comedians believe they should be able to make jokes about ANY subject or person, and if people get offended, that's their problem. I know people who think just like this. I think it's always wrong to get a laugh at the expense of other people. But there's currently no law against it because of freedom of speech issues, unless the intention was to deliberately offend. Some are saying the whole incident was staged, which in itself seems a sick joke.