It seems to me that you are defining incitement in a way that would implicitly make the actual perpetrator less guilty, but that's not true at all, and certainly isn't what is intended here. Of course a murderer is guilty of murder, whether or not somebody else told them to do it. Maybe, in certain extreme cases, it might be regarded as a mitigating circumstance that would affect the length of the sentence, although I'm not sure I can think of a specific scenario off the top of my head.
On the other hand, doing your best to persuade others to commit crime, on your behalf, is manifestly also a criminal offence. Sometimes it's called "conspiracy to commit X", other times it's "incitement", but in either case they have the same literal meaning of trying to persuade somebody else to break the law. Whether the incitement is successful or not is of course entirely the fault of the actual perpetrator; but that the attempt was made nonetheless, and legally and morally would deserve to be punished.