If you want to be a SEAL, blindly (trustingly) accept orders from authority figures who are doing things specifically designed to produce the best SEALs that they know how to produce. If you don't want to be a SEAL, don't.
In fairness, given that he cites George Washington, Martin Luther King and Nelson Mandela as inspiring examples, I don't think that's the intended message here.
I don't think everyone's opinion on whether it is inane or not makes their reasoning equally valid. "Use your head" only makes sense when the head in question is capable of independent critical thought, and the ability to distinguish fact from fantasy.