“an eye for an eye” is more reactive compared to this. In this case, it’s not about waiting for the person to harm you, but acting preemptively if they have a history of harming others.

I guess a modern example would be Putin. Let’s say he randomly walks into a bar unprotected for some reason in Comoros, but the Islanders know who he is and what he’s done as well.

In this case, Putin has done absolutely nothing to the people of Comoros, and his actions have had no effect on the island either. Yet, by this rule, he should be treated the same way he has treated Ukraine by the Islanders regardless.

As someone else has pointed out though, if you don’t know the person at all, then the default golden rule is fine enough.