What are the physical processes underlying all this? The brain is a strange place...
Our brains tell us we’ve Done Something Before We Actually Do It http://blogs.discovermagazine.com/d-brief/2019/04/24/action-perception-basketball/. This is a crucial factor in generating our attitudes and bias - our pre-existing state of mind is directly determining how we respond because it generates perspectives and expectations based on prior experience and existing character.