Because if I push KK with 99$ in the pot and there is 1$ left and my opponent folds a bunch of shit that actually has a +eV call we are making our opponent make a massive error this way.

This probably isn't the case for the ranges OP gave(I'm too lazy to look now) but it's still probably going to be better then calling a 4b and not having a clue what to do postflop. Also since it has been proven to be +eV by MMM v even tighter ranges folding is definitely not our best option.
I'm calling it: You're going to have an epiphany about poker over this.
We already had that conversation a long time ago. I am even the one who initiated it in this thread.

I also misread the assumed situation in MMM/Cobra's scenario. When we 5b we get folds from JJ and half of the QQ's, which are better hands, or, should I say have plenty enough equity to continue. That is where we profit. I mixed up villain's opening range with his 4b range, that is why I thought there were a bunch of dominated hands in his 4b range.

This being said, as yAAwn said and as was seen in that thread I linked to, there are situations where we prefer worse hands to fold, because our EV is higher if they fold than if they call. In other words, even though they are worse, these hands have enough equity to call profitably, and villain makes a mistake folding them. That is where we profit. See post 46 in the linked thread for a preflop example of this.