> In fact I noticed the fallback to those fundamental critique comes always up when one's own favorite did lose.

Of course. We have vested interest in complaining when we 'lose' and praising the outcome when we 'win'.

But your original post seemed to be dismissive of the idea that there is anything to be worried about. Even if we agree on the existence of a major cognitive bias here - it's irrelevant to the question of whether there is a real issue that should be addressed.

The problem with a "backdoor in democracy" is similar to the problem with cryptography backdoors. You can't control who'll make use of them so everyone should be scared.