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FreeSpirit1 See the following definition:
a person who tries in an unofficial way to prevent crime, or to catch and punish someone who has committed a crime, especially because they do not think that official organizations, such as the police, are controlling crime effectively. Vigilantes usually join together to form groups.
https://dictionary.cambridge.org/us/dictionary/english/vigilante
By this definition, he seems like a vigilante even if he's doing the right thing.
I don't see why vigilantes can't be heroes, btw.
Now, at the same time, they can be problematic