From the Mayor:
" After talking to both sides during the past few days, Cooper said he has learned 'there are three stories: there's their story, there's police officials' story, and somewhere in there is probably the truth.' "
Personally, I don't think anyone is blameless here. Sounds like egos got involved on both sides, and there was no graceful way for anyone to back down.
In writing that last sentence, I realized I also described our current situation in Washington!