That was not caused by too much self control. If you did make the wrong choice (and I stress the if since which is better is highly context dependent and you did not describe the situations), then it is simply that you made the wrong choice.
The self control permitted you to make that choice, in either direction, instead of having it made for you by impulse.
(As an aside, a less brave person could easily have the opposite experience. They hypothetically did not have the self control to overcome their fear and fight when they should have. They gave into the impulse to be passive/surrender.)
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That was not caused by too much self control. If you did make the wrong choice (and I stress the if since which is better is highly context dependent and you did not describe the situations), then it is simply that you made the wrong choice.
The self control permitted you to make that choice, in either direction, instead of having it made for you by impulse.
(As an aside, a less brave person could easily have the opposite experience. They hypothetically did not have the self control to overcome their fear and fight when they should have. They gave into the impulse to be passive/surrender.)