Saying one is more wrong than the other begins to sound like an excuse for one side. I make no judgment on who is "more" wrong. Neither seems justified, so they are both wrong.
Also, one side was (arguably) stealing/misusing someone else's property. If they were "belligerent" it does not help their case, but they still seem to have been in the wrong either way. If they were antagonizing, one could foresee (but not excuse) escalation of the situation. Poor judgment all around if that is the case.