This is from a friend who works for Police Scotland, who seem to have all the same issues that the Met do.
I raised concerns in 2017 about a colleague who was racist, homophobic & made misogynist comments on a daily basis. I feared raising a complaint because of a general macho culture in the office & this person's popularity so I expected a backlash. The comment which eventually caused me to complain was him telling my colleagues I was hormonal and that women were really only on this planet for one thing.
I was victimised for raising this concern, my managers didn't contact me for 3 months as I asked for support. I had a breakdown. He was disciplined and sent back to the same office as me. A friend and colleague and manager of another team got me moved in to his office. He later left the organisation.
The perp would stand outside my office and intimidate me. I raised concerns. They did nothing. I was the problem. He made further racist comments. They did nothing. My direct line manager told me that they were recruiting a new member of staff to go in the shared office. It was a female. They have no other females in that office after I left.
I had also been told by another colleague that he had been forced out of that office due to bullying. He had had a disagreement with the perp who then started a campaign against him. I raised another concern that this incident and putting a female in that office with the perp who was allowed to continue his behaviour, was an issue. They suspended me. My line mgr agreed with me, he wrote to the head of ICT to say so. They allege that I am guilty of gross misconduct.
Now, if that is how Police Scotland deal with the raising of concerns over red flags, it doesn't surprise me that the Met or others would do the same.