You are not morally obliged to extend rights to anyone who does not respect your rights. This is tit-for-tat, the foundational principle of functional societies. Unleashing a bot on a group of people is a grievous disrespect that shows you have no respect for their time, and in return they are not obliged to respect you.
Suppose a drunk man on the street is acting aggressively towards you and four of your friends, but you can push him out of the way and continue walking. Should you knock his teeth out? Actually I don't know, maybe you should inflict some additional cost on behalf of potential victims with less power.
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