apologist
/əˈpɒlədʒɪst/
noun
a person who offers an argument in defence of something controversial.
‘critics said he was an apologist for colonialism’
synonyms: defender, supporter, upholder, advocate, proponent, exponent, propagandist, apostle, champion, backer, promoter, campaigner, spokesman, spokeswoman, spokesperson, speaker, arguer, enthusiast
I see your problem.
You don’t believe people when they tell you who they are. You imagine their actions and their beliefs to be separate from the individual even though they are the beliefs and actions of the individual. Your idealism doesn’t reflect reality.