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Morality, you say? As has already been noted, morality is not the same for every individual. Interestingly, even so-called "public morality" differs among different people. Different people live in different environments; in some places, 7-year-old children drinking and smoking is normal, while in others, it's a catastrophe.
But, in my opinion, the issue isn't that at all, but rather that some people have an inflated (often, groundlessly) sense of self-worth, which leads them to believe that their opinion is the Absolute Truth.
ps It's the most real, bloodthirsty Gestapo, I swear.