Not just their ignorance or apathy but their perceived tribe or self ideation bias.
They think the person is good because of acknowledging similarities in their personhood and thinking it makes them the same and to hold them as wrong would hurt their ideology that they are wholly good (which is insane cause different people), sometimes through careful messaging you can lead people to wrong conclusions through manipulation of empathy or false logic and conclusions you come up with "yourself" are more likely to be stronger in your mind on conviction and less able to change.

We are tribe people that are easily self assured to get through what would be a tough life in the wild. And it's easily manipulated by people who make it their job to do so.