Trampolines are more dangerous than most people think. Most just get on them and don't think twice about getting hurt, until they actually are hurt! With that being said, I'm not afraid to jump on one, or let my kids on one. It just means you need to pay a little more attention to what you are doing.
I would be willing to bet that even though it was a 'freak' accident, that Chamberlain was probably doing something stupid, or his kid was doing something stupid. Then they had an accident. Think first, and you wouldn't have these types of issues.