I don't quite catch your drift there. If I am taxying or even just sat there parked with the engine or engines running and I see a risk of causing injury to someone then I have an obligation to prevent harm to that person to the best of my ability. If that means that my aircraft has been interfered with then that is something I can take up later but there's a higher duty to preserve life, isn't there?
Many people are completely unaware of the risks posed by aircraft and will put themselves at great risk of a prop or rotor strike or of being ingested by a running jet engine without meaning to do that. I have occasionally had someone decide to make me stop by getting in my way, at great risk to themselves. Guess what? It works! I am not going to try chasing some muppet out of the way, given that he might see no reason to move out of the way of something he cannot see.
Let us hope this was an accident and nothiing more.