Final solution is more useful to the public as a reference to the Holocaust rather than as a generic term. It’s better as a means to indicate a train of thought to be avoided, or an obvious wrong (or at least immoral) answer to a problem that might come up if the situation is left to fester long enough that responders get desperate.

I think of supervillain plots based on situations where the villain has a point, but invents a solution that involves the massacre of a lot of people. Heros have the double responsibility of stopping the villain and addressing the problem in a more measured way… or should. In the MCU, the problem is often left without consideration.