If you are basing that OPINION based on the movie, Marcus said himself that the movie people to some liberties with that sequence. But he let it slide. I would wager he let it slide so not to sully the memory or honor of his brothers who are no longer with us. Remember, Murphy was an officer, Marcus was a Petty Officer (enisted). Marcus did not make the decision, Murphy did, as he should considering all of the pros and cons of his TEAM members.
In the interviews I have seen of him, h3 called the movie an accurate portrayal.