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Its trying to establish that Allen is a racist based upon his attitudes and actions 30 years ago. Even if he was racist back then... people change. People can grow. Or devolve sometimes too.
And lets say that everything said and implied here is true...he was a big racist bully in college and he still is a big racist bully now. Allen supporters won’t make the connection between then and now, so they will see this as an attack piece, and hence ignore the content of this article.