We don't need to argue about if he knew better; he did, from his own mouth. We need to argue about if it is ok and if it is ok for the people in power to do nothing about it because it's "their team".
At some point soon we need to realize we the people are on one team and everyone saying otherwise is trying to hurt us.
This might be good for a generic politician running for an election to say, but it's not true. We're not on the same team; we're different groups of people with different values who hate each other. Our politicians are the people we've voted to represent us. It's not like Trump, for example, hoodwinked Republicans; they like everything he's doing, and have for ten years, and a lot of it is because people like me hate him. We're not on the same team.
SecDef Lovett only rose to O-4 before going into the NYC business community and then becoming a Special Assistant to SecWar Stimpson in 1940. https://history.defense.gov/Multimedia/Biographies/Article-V...
SecDef McElroy came up through Proctor & Gamble, no government or military experience. https://history.defense.gov/Multimedia/Biographies/Article-V...
Just as a few examples of adequately-successful SecDefs coming from "unimpressive" paper resumes.