Jack,
People with wisdom and integrity have personal feelings as well. This is why we have 'conflict of interest' laws and people with integrity usually will 'recuse' themselves if   they feel there  is  either is a 'conflict of interest' or there is the  appearance of 'conflict of interest'.  If Mueller was truly honest, he would have recused himself from this case. An innocent person, in particular, would have every right to demand  it.