what allows some individuals to take a stand against prejudice/oppression while others choose to participate in it?

The people that stands against prejudice and oppressions are those that have a firm believer that human rights must be respected and no human must be unduly descrimited. They usually advocate for the respect of human rights and also protect the vulnerable in the society.

However, people that choose to participate in prejudice are usually people from different cultural groups and racial differences.

Prejudice is also always as a result of human conflict which makes strangers hate themselves to the extent of causing harm to each other.