I would expect that this happens more often than not, but via friends and family. If someone was stalking or harassing one of my sisters we'd find a way of handling it, legal or no.
It's not preferable but if it's the only way to get results... Nobody deserves this kind of treatment.
Yes, in specific cases this might be the right answer. However we have to say "No, rule of law, blah blah" because we don't want everyone doing it or we're back to a tribal society with vendettas and blood-feuds.
A society that will not take intimidation and threats to someone's livelihood seriously has already regressed to the level of tribal societies with vendettas and blood-feuds.
It's not preferable but if it's the only way to get results... Nobody deserves this kind of treatment.