So the "malevolence" of these bot miners is not directed at the cryptocurrency itself. There is no illegitemacy in terms of protocol, no rules are broken, no extra supply is created etc. It's a case of one person stealing another's computer for a while to mine on. Worry if you play a lot of Grand Theft Auto.
Well, worry if you are a dumb child that downloaded a pirated copy of a game you probably aren't old enough to be playing in the first place and you downloaded said game because your mom and dad won't buy it for you since you're 12 years old.