The categorical imperative should be used here. "Arrest people I don't like" fails the categorical imperative. However, "check things that destroy society and make everyone worse off except for a select few if left unchecked" easily passes the bar.

Nothing is absolute. There is a spectrum without an obvious optimal point. The recent neonazi rally in the UK did a lot of damage that could have easily been prevented.

Why does most of Europe have such a higher standard of living?