I don't believe that I can simply look at the choice someone has made and determine what their thoughts were, while they were making them.

I also don't believe that knowing what their thoughts were would even help me, definitively, as humans and their environment are too complex for that.

I also don't think humans always know what actually motivated to make a decision, as it's often hindbrain stuff that they aren't consciously aware of.

We can only analyze trends and tendencies, and those often turn out to be wrong, or don't hold true indefinitely.