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MushroomFaerie Couldn't have said it better myself. Lack of understanding gives judgment. People who are judgmental have this comfort zone where they believe what they do is done in absolution; that they have never made a mistake on that end, and because of that, no one else should either, because if they do, they will break that absolute cycle.
Another thing I've noticed is that when people are expected to change behaviors, they switch to the opposite extreme. So when people have to change a bad habit that they have done to an absolute degree, they have to repeat the same in the opposite direction. Because of that, when they see that others are having a different lifestyle in opposition to their absolute performance, they think that these people have brought themselves to destruction.
That causes them an irrational fear of "letting themselves go to the point of no return", so they attack others to fight it off. Problem is, they don't fight off the problem by helping them, they fight off by saying the person is a symbolic representation of the issue. That the issue is a hardwired part of what makes the person function.
They haven't been in their shoes and their irrational fear makes them lack understanding. If they were there, they would understand.