The government (most of them anyway) can do this almost immedeately as nearly all of them have some clause allowing action in the event of known criminal activi

The government (most of them anyway) can do this almost immedeately as nearly all of them have some clause allowing action in the event of known criminal activity (whether they will after this goes through all the beaucracy is a different matter). The question with the parent is would private citizens be within their rights to do something like that. To that, the answer is, for the most part, no. I do not know of any countries (except palestine) which condone vigilantee justice.