Michael Burnham is the first Federation officer to ever commit mutiny but it's notably something that didn't involve any other crew members, so I'm not sure mutiny was the right charge. And is Ben Finney the SECOND officer to commit mutiny? Gary Mitchell? I mean, in Mitchell's case he was driven insane beforehand. Because Captain Kirk has to deal with a bunch of attempts to kill him and take over his ship. It seems like Michael's actions won't be so damning in a few years.