At this point, you're repeating a lot of what I say about stats. The bias in stats typically comes from either error or intent. An agent uses intent.
But the biases we all have when we observe things or remember things are part of the human psyche. Stuff like Dunning-Kruger effect, confirmation bias, negativity bias, self-serving bias, optimism/pessimism bias, hindsight bias, decline bias, and of course, the ever popular Backfire Effect. That last one is when you try to prove someone else wrong on a subject, and their reaction is to take the correction as a personal attack and then only cling more deeply to their beliefs. We see that one daily on this board.
This is all psychology stuff, and admittedly I am not an expert on it, although the Dunning-Kruger effect wants to me to think I am...