We humans do many things we don't want to do and don't even understand. It seems unreasonable. So, we refuse to think about it very much. I personally find determinism very helpful and a satisfying way to look at life. I have never seen any behavior, no matter how unusual or strange, that clearly could not have been caused by behavioral laws.
None seem too hopeful.
List disturbing situations. Recognize that you would do what others have done, if you were them and had their past and environment. Accept your own past behavior . Your task, when anything upsets you, is to reduce the stress by understanding why it happened. To begin with, you might consider what situations and behaviors you would like to be more tolerant about, more accepting of, and less disturbed by.