He's not my friend and I don't see him as a hero. Strange phrase to use...Just because you see him as some vigilante hero, does not make this behaviour acceptable. Your friend is a thug.
Throwing lighted cigarettes into cars is extremely dangerous.
This guy probably needs psychiatric help.
While I don't condone his actions I do find it amusing. I have little sympathy for anyone who throws a cigaret butt out of their car so if they end up with a burn in their upholstery then good enough for them. If they get some coffee in their lap then even better. When you think about it for a pedestrian to do what he does the car has to be stationary or moving very slowly so it's not that dangerous.