I agree with your sentiment regarding arbitrary law enforcement and the huge waste of times it is to chase people smoking pot and similarly harmless things. However, you seem to imply (please correct me if I'm wrong) that this justifies the vigilantism. I find that idea to be very problematic on many fronts.
Is it vigilantism for you to stop me from walking into your house? That is the crux of my argument. If you, or a group of people, rightfully own land then you should be free to pay guards to stop people to enter it.
