Agree. Remember the British were already under order to raid the towns for supplies ('powder and ball'). In Lexington, the militia had made a show of force, following which gunfire was exchanged, and the British officers authorized a "huzzah" in celebration of the death of several militia members.

Quite a stretch to call resisting an army under orders to seize munitions by force "murder" per say, this was a clear act of self defense.