It’s really crazy how hard it can be to not fall into all-or-nothing thinking. Even people who are philosophically trained, or have a general disposition towards uncertainty, can quickly lapse into all-or-nothing thinking when stress takes its toll, or emotions take over.
When it happens to me, as it does, and has recently, it really causes me to reflect on how much of my own mind I consciously control. I know, intellectually, that the answer is: very little.