A definition of excessive force

AP, reporting on yesterday's killing of at least 50 Muslim Brotherhood supporters: 

The shootings Monday of Morsi supporters prompted questions about whether troops used excessive deadly force, an accusation the military dismissed as unfair.

"What excessive force? We were dealing with people shooting at us with live ammunition," chief military spokesman Co. Ahmed Mohammed Ali told The Associated Press. "It would have been excessive if we killed 300."

Confident in the army's position, Ali asked those at a televised news conference to stand in silence to mourn the dead. Later he expressed regret for the loss of life, but did not accept blame for the killings.