They've done nothing, of course. But they're not the OP's problem anymore. Its like when faculty go on strike. Hurting the students is the goddam point - its the only think that makes the University take any notice.
As the wise man once said, "Deserve's got nothing to do with it".
I don't think a strike is the appropriate analogy, in the case of a strike, the discomfort inflicted on the students are presumably a means towards an end, so as to convince students and parents to exert their influence on the administration to pressure them to negotiate with the people striking. In this case, unless the goal is to reverse the tenure denial, otherwise hurting the students in this instance is just gratuitous.
In any case, at least in a strike, you're not being paid, so it is somewhat reasonable to withhold your service. In this case, the appropriate analogy is an adjunct position, you don't owe them any debt of loyalty, but you still need to do the job that you're contracted to do.