My original theory when the first issue dropped was that the whole thing was an incident that spiraled out of control as a result of a misunderstanding between Booster and Ivy causing one of them to snap and a fight to break out. If Booster thought that Ivy was a villain at the Sanctuary and the conflict escalated in a manner that got Ivy involved I could see why each would blame the other.
But with more hints from the Puddlers this issues it seems as though this was more of a premeditated attack, perhaps by a group.