why does westrum see the IM as a danger?

Wrestrum has brought charges against the narrator to the committee. He then announces that the narrator is a danger to the Brotherhood and charges him with attempting to overshadow and dominate the Brotherhood. He presents the article the narrator was interviewed for as evidence, crying that he is an opportunist and has illustrated himself as the Brotherhood instead of part of it. Wrestrum also names an unknown plot against the Brotherhood that the narrator has evolved, through which he trains supporters to only listen to him, for example.