Yeah, he's an asshole, but look at it from his point of view:
You're in charge of the biggest, most technologically advanced ship humanity has ever built. Thousands of people are on board. Then all of a sudden, the ship is dragged forcefully to a strange world and attacked by an unknown enemy. You and your crew barely survive, and there's an opening to retreat, report to command, and receive reinforcements. But a formerly MIA Spartan and his clearly rampant AI companion tell you to [i]stay?[/i]
Wouldn't you have the same reaction Del Rio did? I know Master Chief is a hero and all, but we don't know what the hell we're dealing with, and I sure as well wouldn't go in guns a blazing, unnecessarily risking the ship and the crew's lives.
And he gets removed from command for that. What the hell?
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It's straight up poor writing. I get it. 343 Industries wanted to make Lasky look sympathetic in comparison, and they wanted to show that Chief was committed to Cortana. They could have easily have done that without going "Let's create a one-dimensional character with NO redeeming qualities, and who's every line reeks of incompetence and insecurity". Even my Navy Dad thought he was an unrealistic character. "There's no way a person like that would ever be put in charge of a ship." There's no reason to defend Del Rio, he's a terrible character which is a shame because 343 Industries has shown that they can make some good characters like Tillsman.