This is a mistake, IMO. You don't apologize for officers doing their job or for an unruly threatening mob and firing shots, causing delay. This will not help. The people he's trying to mollify will be angered even more, now saying, "See? They done wrong. They know it." It'll just fuel unjustified indignation.
Like this:
Chief Jackson's apology to the Browns and the St. Louis community shouldn't be in the form of a scripted video, but in a resignation letter.
https://twitter.com/AntonioFrench/status/515147134891343872
He played into their hand, probably at the suggestion of the DOJ/libs/politicians. The mayor didn't need to apologize either. At this point, the tail is wagging the dog. That needs to stop. Stand by the truth and don't apologize for it. I like this man and hate that he's been attacked and a bounty placed on his head. You cannot reason with unreasonable people, and those who will riot and attack police because their candles burned something are beyond unreasonable. As Capt Johson said, that's about hate, violence, and taking from another.