There’s isn’t such a thing as moral blame, for this presupposes some kind of consequentialism, in which an action is wrong by virtue of it producing bad consequences, and the evilness of these consequences must be distributed among those who caused it.

Consequentialism is obviously false, so there’s is no moral ‘blame’ to be distributed.

Rather, each actor is fully morally responsible for their own actions (and not for the consequences of these actions). The orderers and henchmen all receive full responsibility for freely murdering (or whatever the case may be).