It seems to me like he started off in a fairly normal place, and went over the edge in a big way.
As much as some people don't understand, there are plenty of non-white people who don't agree with or believe in many of the things progressive identity politics say they are supposed to. Some of them really hate them. My in-laws are largely Caribbean, and most of them are pretty conservative on a lot of these questions. They could probably have had a comfortable family dinner with Laurence Fox a few years ago.
It seems like since he has gone into the political side of things over the last few years it's tipped right into some very weird persecution complexes and behaviours meant to shock.
Maybe that's understandable to a degree, because it does seem like if you are a regular white guy who doesn't buy into that stuff in the acting world, if you don't keep it very quiet, you will be persecuted. In somewhat the same way actors who don't buy into gender ideology are.
It's easy when you are being unfairly labeled to start to develop some kind of conspiracy issues, because it does seem like a conspiracy, and then it seems like people struggle to figure out where the line is between real and imaginary. They just spiral down.
And he may well have been a little unbalanced in the first place.