I agree too. Star Trek has had corrupted humans since season one with Roger Korby, Tristan Adams and Ben Finney, but when bad admirals became a trope, that was the point to slam the breaks on that idea. I think they actually kind of did, but the situation got way messier with the introduction of Section 31.
At first they were like a bad admiral conspiracy, but writers seem to fall in love with the idea of a shady black ops department that makes the hard choices to the point where they've apparently been made a crucial part of Starfleet. A bad admiral department, acknowledged by the characters as just being how their system works. I kind of don't like it!