Having been a cop before, I'll say from what I've read the police did exactly what they should have done, and what they were trained to do. It sounds like typical reactions from uninvolved parents. The fact that they allowed their child to get into this criminal group, drink excessively, and become so violent, attests to the fact that these parents were not doing their jobs. This type of parent is usually the one who cries foul when their child ends up in a situation like this.
Their allegation that police were trigger happy is ridiculous. Three officers, and seven shots fired (says a witness)? That's perfectly normal. These officers are typically trained to fire three shots in reaction to a threat. Three officers, and three shots, equals six shots. If there was seven shots, eight shots, or four shots, all would be perfectly acceptable based on the situation.
If the police had already tried pepper spray and it did not work, and this kid still had knives and was threatening to kill officers, they really had no other choices at hand. If this individual had in fact been intoxicated (alcohol) or influenced by ICE or some other drug, that pepper spray was likely to have no real affect on him anyhow. Which rendered the use of it pointless on such an individual.
As part of the training I received, we were shown videos and first hand demonstrations of how to deal with knife wielding subjects. It can surprise you how quickly a subject with a knife can close the gap of space between them and an officer before an officer can draw their pistol. These officers more than likely already had weapons drawn, but there comes a point where you simply cannot allow a knife wielding subject to get any closer and retain your personal safety.
Shame on the parents. Shame on the kid. Shame on his peers who taught him this garbage.
God be with those officers who were forced to take another human's life. And God be with the family and friends who now must cope with the loss of their loved one.