The murderer is the initiator. ISIS is the initiator.
Example: "The US should murder the Japanese people and nuke all of their cities immediately." Japan isn't an aggressor, hasn't invaded anyone, isn't slaughtering the people of some country they're trying to annex (ISIS). Calling for a response to to the initiation of violence, is not the same as calling for the initiation of violence. If you remove these blatant lines, you can never differentiate on a legal basis who is the victim and who is the perpetrator in acts of eg crime.
