I'm sorry I can't answer your question. But I noticed no one had replied to your post. So I thought I would.

I don't know how old you are. I'm an older person who has struggled silently & alone all of his life with (still undiagnosed) mental health issues. The one thing I can tell you, based on my own personal experience, is that the older one gets the more difficult it becomes to "keep the cork in the bottle", so to speak. It's sort-of like there's a storm raging within. And it takes almost all of your energy to contain it & carry on with your day-to-day life.

As you get older (for me it was in my late 40's) it just gets harder-&-harder to maintain control so that, after a while, all it takes is just one relatively small upset to cause it to all come crashing down. In my case, it was a not all that terribly serious bout with cancer. So, from my perspective, I would say I don't know about the brain mechanism or governor idea. But is it possible that one day all heck is going to break lose? I'd say yes it's possible. It may even be likely. But that's just my personal opinion... for what it's worth.