I was president of my fraternity in college, and after years of our chapter having presidents doing absolutely nothing, I got a lot of pressure from our national office and the school to establish order and rules to improve things or else our good times were gone. Our guys didn't like that too much, and I got the blame for being tough. But, it ended up winning us awards in the end and we still had a great time.
I tell that short narrative because Gettleman went through the same thing (on a way bigger scale). New leadership doing logical things that replaces old leadeship that sucked can sometimes create anger amongst those below until they get used to it. Gettleman is building a winning team with accountability. That's what defines success after all, accountability.