This is a subset of the question of "is it permissible to pray for anyone's death?" and "is it permissible to pray for an evil-doer's death?" and goes to the question of whether one may pray for the death (say by illness) of a very powerful evil doer, a national leader who is causing an illness to spread throughout a nation? It certainly seems like it ought to be permitted. This is not about taking the action, but asking the Holy One to work out the wheels of justice so that he who is doing evil (failing to act, ignoring reasonable disease prevention strategies, attempting to profit from human suffering), is taken down by the evil he does. But if it is permitted, who says so?
I don't know where or to whom it might apply, but just in the abstract if such a situation should arise....?