Note: I’m not asking for legal advice. Rather, it’s a thing in some countries (like Japan or Indonesia) as I recall watching a video depicting an Australian tourist in Indonesia witnessesing people pursuing the phone snatcher by ganging up on him in which they eventually caught the dude & undercover cops managed to arrest him. Now, the question remains: are people in the US allowed to conduct a citizens arrest in the US?
There was some kind of massive protests involving trucks that sort of wrecked havoc for months in a major metroplex in either the US or Canada.
Like a week after they citizen arrested someone the police shut it down.
Governments take the monopoly of violence very seriously in authoritarian countries.