Why is a quiet follower hated like just like the bullies?

Let's say someone got framed for stealing and unfairly suspended. The quiet follower knows the person didn't do it but she doesn't speak up out of fear and just follows the majority. She never joins the bullying nor frames anyone. She doesn't bully nor defend/helps you. She's did nothing.

Then suddenly the bullies aren't the only ones hates and their reputation ruined but so is her. Why is a quiet follower like her hated equally? She didn't do what the bullies did.

Why is a quiet follower hated like just like the bullies?
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