A sense of control is beneficial for mild stressors but detrimental for major stressors.

“only if it is a mild to moderate stressor because what's happening then, your sense of control is completely independent of the reality of whether you have control or not, but in the face of mild to moderate stressors, a sense of control gets interpreted as, wow, look how much worse things could have been. Thank God, I have control, I'm on top of this to master my fate. In contrast, if it's a major stressor, all that arbitrary sense of control does is make you think, oh my God, look how much better it could have been. I could have prevented it.”