I always remember a case in Britain where a vigilante mob attacked the house of a guy they thought was a paedophile. Turned out that the guy was not a paedophile, he was a paediatrician and the whole misunderstanding had been bought about by a few idiots confusing the words and spreading the rumour.
That is a strong case against vigilatism.
"After the alleged crime, police say the (9 year old) girl ran across the street to her home, nude, and told her dad what happened."
~snip~
"When the father went to the home, the suspect was still at the home, apparently lying naked on a bed. He then took off, getting away from the father."
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Doesn't seem to be much rumor or confusion in this case.