That argument doesn't work, Bloo. We know very well that people go insane even without any sort of augmentation. Otherwise the concept wouldn't exist. I mean I know what you're trying to say, but what it comes from is that they're strange. And I don't mean that as in weird, but, you know, alien.
But before that, we, as natural, organic people, perceive our own limitations as stemming from our natural organisms and see technology as an improvement. One of the most basic, natural fears that we share with everything else that is alive is the fear of predators. We also perceive predators as superior. And since cyborgs are people with bodies made of technology, we instinctively perceive them as superior and therefore as predators.
And another thing that is strongly related to our fear of predators is the fear of the strange, the alien. That is what gives us the pack instinct and the tendency to view other "packs" as enemies. Because predators also prey on each other. So if someone's not in our "pack" we see them as a potential enemy. This is what causes things like gangs, nationalism, racism, homophobia, the mafia and so on. It's our fear of predators that makes us fear the strange.
And then you have cyborgs who are both strange and predators. Strange predators. That's something that should be instinctively terrifying. Of course these instincts are beneficial in a survival-of-the-fittest type of world, but that hasn't been the case for humanity in a very long time. Yet they still control us, because we are made of them.
So what I'm saying, I guess, is that your argument that only the cyborgs go insane in stories stems from the same prejudice. It's like reverse-racism, I guess. It's not intentional, you just momentarily forgot the fact that cyborgs going insane is no different than organic people going insane. An epileptic seizure is basically just a short-circuit.
Then there's the AIs going insane. One of the things that causes this is that, while humans are born weak, AIs are born with power. Oftentimes they want to kill humanity because they've concluded that it needs to be done and let's be honest, anyone can deduce that at some point. Humanity has proven to be a virus, it's not an edgy teenage thing to believe. We spread with no purpose and we convert environments so that we can spread even more. If an AI is born with the idea that virus = bad and it knows humanity, it will want to kill us.
Then there's other types of AI like in the Matrix. The AI in the Matrix didn't go insane at all, it just became the top of the food chain.
Also, in Isaac Asimov books, I'm pretty sure that it's usually the humans who fuck shit up and Robots are more like people than humans are.