1. I wouldn't call what he does immoral, but he is a jerk. Even his cameramen attest to this.
2. I don't think he's trying to prove a point, he just likes showing off his skills and being a jerk.
3. Having a soccer ball kicked at/into my car or work establishment is not really a big deal. It's a soccer ball, it really isn't going to cause catastrophic damage. I would probably be annoyed, but not to the point where I'd want to chase the guy down or call the police or anything. And I wouldn't really compare these situations to being "assaulted by a giant bottle of hair-remover," since that can actually inflict damage both on your body and your image for a long period of time.