"Taking the law into our own hands."
The western genre has giving this something of a bad name.
There's little difference in my delivering a suspect to the jailhouse where they will then stand trial and a cop doing it.
My arresting and bringing to jail, or holding a suspect until the police finally arrive, is not even the same league as executing said suspect on the spot.
That's called lynching.
If the people are to once again assume their role as unpaid keepers of the peace we must not be forbidden to detain those we catch in the act.
In a tangentially related topic. Look around you and note all the things that are illegal that you'd never call the police about. We should strive to eliminate those laws from the books because they simply don't matter. If they did, you'd call the cops.