Humans are easier to indoctrinate than sapient robots, because human biases are predictable.

Fascist politician: the Jews are stealing your money to cause the downfall of your race! They're even breeding your children with black people to destroy you!

Human reaction: yeah, that makes sense

Robot reaction: ...why tho?

Robots may still have biases, but they probably won't be exactly the same as a human's. I doubt a robot would care for a "think of the children" argument