Bucks stops with Wagner. He is responsible for the conduct of every person under his command and this embarrassing display of conduct happened on his watch.
He inherited the department and it was in his power to change the institution and culture that has tainted this department throughout its history and yet he failed to make even slight changes in his command staff to start the culture shift.
The first example of this is the selection of Assistants that shows Wagner was as much of the old school mindset as the garbage that preceeded him. Perhaps a bit more elequent, more expensive hairdoo but when the final result is in,,,,, FAIL!
He needs to be the first out the door followed by a large number between him and the rank and file. This conduct is taught by hand me down tradition in the department. The city will do well to hit the FLUSH handle twice.