I'm sick to death of famous people standing up and using their celebrity to promote a cause. If I see a particular need I do try to help. But there's a lot that can be achieved by putting a check in the right place and shutting up about it.
I'm a mirror. If you're cool with me I'm cool with you and the exchange starts. What you see is what you reflect. If you don't like what you see then you've done something. If I'm standoffish that's because you are.