If it helps comfort you, I'm an enby, phenotypically male, bald as a cue ball, and my natural testosterone is so high I'm practically a teen despite actually being three times older. I am and always have been left AF and a fierce supporter of human rights, including bodily autonomy. I had an incident earlier in life which led to my testosterone temporarily dipping by about half for a few months and nothing about my behavior or beliefs significantly changed. I did nap more but that might have been coincidental. That's about it.
I think most people like the guys you mentioned are just assholes regardless of their testosterone levels.
My father also was a MAGAt, up until his death. I'm pretty sure it's not genetic, thankfully.
If you do start to thin, there are a ton of treatments to prevent and reverse it. As long as you get on them early, you'll likely not notice much of a difference. I was just super poor when I started balding, so I didn't have a choice. Now those poor follicles are toast.