It's something that has increasingly bewildered me: why do we as people get so biased when we don't like someone? So biased that we can't see anything good in t

It's something that has increasingly bewildered me: why do we as people get so biased when we don't like someone? So biased that we can't see anything good in them anymore, and we can't recognize (sometimes any of) their accomplishments? Biden, Trump, Elon, etc., depending on what side you are, there's always someone to think of as an example.