Then in order to force someone to murder, either they would have to be willing on some level, or-- you might have to get creative. I have to wonder if it's possible to alter someone's mind to think another person is their enemy, or otherwise some kind of threat, to push them into it.

...it is sometimes possible to spend more to make powers stronger, too, so we may want to ask if it's possible to make it harder to resist if this is something we're pursuing.