As others have said.....you're wrong on this occasion.By no means a fan of hers, but she may have a point.
We are being offered (and some have been sold) the lie that anyone who investigates an MP for contempt of parliament is by definition corrupt and involved purely for personal gain.
Many years ago I was asked to investigate an accusation of scientific fraud, the complainant a contract research company (CRO). I wrote a very long report (52 pages, yes, I know ) that concluded that while there had been some sloppy work done by the accused, and that a published paper should be retracted, I could find no evidence of fraud. In this case the accused had nothing to gain from their sloppy mistakes. But....
The head of the CRO lost his shit and wrote to the principal of my university claiming that by not finding scientific fraud, I was therefore guilty myself of scientific fraud. My employer felt bound to undertake an examination. I was fully exonerated.
The committee investigating Johnson has my sympathies. They will certainly be hounded by the Johnson gang. It is a quite horrible look.