I think a question of judgement comes into it.
Whatever good, someone like Vaz done in his career will be questioned next time he gets up to speak, and if he thinks that isn't the case, then that ability of judgement is being ignored.
If these accusations are proved to be true, then there is a section of the public that will no longer have faith in him. That is already proven here on AB, by people that think that he is an MP because of his race and colour, not by any abilities that he has.
When someone gets up to speak on any subject, I would want to be able to judge and believe what he is saying, not to have doubts about why he is saying it.
The late Cyril Smith had many faults, paedophilia amongst them. But one of his other sins was that he fought tooth and nail against legislation to curb the use and care of asbestos. He didn't argue against the eventual legislation because he believed it wasn't necessary.......he did so because the asbestos firm in his Constituency paid him to do so.