And that's totally enough of an excuse for committing murder. We should just let all the prisoners that feel really bad about it out of jail. I'm sure that will be an entirely unremarkable conclusion, yes?
My point is that the argument that they must be punished because anyone who would do this is an unfeeling sociopath who will not feel any guilt about it is fallacious. It is also fallacious to believe that one person can use another as a simple tool with 100% predicatble results. There are certainly circumstances where the outcome is more predicatble than in the OP's scenario, and there are laws to cover those times. But the idea of punishing someone because they hoped their spreading rumors would lead to a specific person's death- aside from the difficulty of proving that- is ridiculous. next you'll be talking about outlawing wishing someone was dead.