The armed man was a boy who went to Kenosha with a “semi-automatic hunting rifle” ostensibly to protect life and property from rioters - I think that fits the definition of a vigilante. It went sideways due to a number of causes.

Protests are already regulated, but law enforcement wasn’t controlling it - neither was Rittenhouse, in fact he escalated it. That’s why I think vigilantism needs to be regulated in the need for public safety.

You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.
R. Buckminster Fuller