I think, given what public life in Scotland is like, it might have been unthinkable for Kemp to arrive at the conclusions that we all think are obvious. We had the FWS judgment right in the middle of the tribunal, and ScotGov seem absolutely determined to ignore the judgment. I don't think it's necessary for a public official in Scotland to be leaned on.
You're right though, it's the madness of producing this kind of judgment, under what he must have known would be close scrutiny, that I can't wrap my head around. Basic sexism and/or classism (or maybe just doctorism) could have fed into how credible he found the various witnesses, but I would still expect an experienced judge with, as far as I can tell, a good reputation to produce something that looks credible.
I've never heard of a judge self-sabotaging, and it would be unethical for one to do so, but this Bart Simpson book report of a judgment really makes me wonder. It should be career ending, but in Scotland, who knows...