Kouki had better have understood after cooling his head.
He lets his ideals run his emotions, and lets his emotions run his decisions as a result so much, anything that challenges those thoughts appears to be considered as opposition, or he wouldn't have snapped at Nagumo the way he did. And was that an order? Forgetting that you aren't the Captain of that ship, are we?
Go in guns blazing, and he will essentially be challenging an entire country's way of life, potentially an entire world. I doubt he's actually ready for those kinds of consequences, and worse, he'll drag everybody else down with him.