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I do not think there is a harm unless you feel there is a threat.
I do not think there is any harm unless there has been some threat to you. Your attendance would not legitimize the person's position.
Thanks for the additional information. In that case it does not make sense to attend a meeting by him. He needa to be marginalized.
It is always best to give as much info as possible in the beginning so we can provide a fully informed answer.