Why is it weird that mr Underwood defended atticus?

It is unusual for Mr. Underwood to defend Atticus because he is a staunch racist who typically aligns with the prejudices of the community. His support for Atticus during the trial of Tom Robinson, a Black man accused of raping a white woman, goes against his usual beliefs and highlights a complex moral stance. Underwood's defense signifies a recognition of justice and humanity that transcends his previously held biases, making his actions unexpected and significant in the context of the story.