You're missing the point. What matters is that GP's friend had used "activism" to describe acts of simple spite or revenge, and the label does not apply. Such behavior stands in the way of real activism. Perhaps you feel the spite is deserved, the revenge justified, based on the level of potential consequence. Your use of hyperbolic imagery and character assassination suggests that you might, and I might not even try to dissuade you ... but don't call it activism. Words have meaning, and a potato is not a pear.