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Round and round you go. Where you stop ----
How does a man getting 'high' in private 'endanger' his neighbor? What potential for harm, what clear & present danger is there?
Try to come up with some reason to stop him, prior to any violent act, that takes into account the rule of constitutional law, please.
He is presenting a threat to his neighbors. Plain and simple. Be it a threat of physical harm, of financial harm, it is HARM none the less.
Your plain & certainly simple declaration is not a reasoned answer, it is merely restating your original opinion. WHAT is your imagined threat? Can you tell us?