It is commonly agreed upon in the objectivist world that there is such thing as violence by proxy. In other words, if A persuades B to initiate physical force against C, A is morally responsible and should be punished. The type of persuasion is usually irrelevant. It could be blackmail, religious brainwashing, racist propaganda, monetary incentives, etc. The guilty are always the Mafia boss and the leader of some cult, and rarely (and to a much lesser extent) the ones who actually pull the trigger.
My take on this is that it is wrong. A is not guilty and should not be punished. What is evil