To be clear, he's not just passing the buck to avoid having to improve his police department. He's been making progress reforming since he took up the post.
https://www.buzzfeed.com/albertsamaha/dallas-police-numbers?utm_term=.wnV5zYEazB#.vxGREPNeEW
Brown has fired more than 70 Dallas cops since taking office. But he doesnt just fire bad cops, he also announces the firings and the reasons for them on social media. Its a bold sort of transparency for which, again, hes been criticized by police groups. Shortly after taking office, Brown fired a police officer who had kicked and maced a handcuffed suspect. But he not only fired the cop, he publicly praised the officer who turned that cop in, an implicit acknowledgment and criticism of the notorious Blue Wall. One of the things that I really want to express about Officer Upshaws action is that we should not as a department ostracize him in any way. We should applaud him coming forward, him intervening, Brown said.
https://www.washingtonpost.com/news...ing-those-things-could-now-be-more-difficult/
Dallas PD still has work to do, but they trying. Progress is being made. It's never as quick as is wanted or needed, but it's still worth acknowledging. And if you look at the protest in Dallas vs the protest in Baton Rouge, it's night and day. Dallas had zero riot gear, no tear gas, etc -- they didn't bring in heavy equipment. They didn't surround protesters or drag anybody away. They didn't point guns at anybody or shout orders on a loud speaker. They blocked off streets
for the protestors.
He's essentially saying "Be the change you want to see."