Swearing is viewed as a bad thing mainly because of religion, particularly anything puritanical. It’s the equivalent of taking the lords name in vain for some people. When I was in 3rd grade, I said dammit after dropping my coat instead of putting it on a hanger. I learned that word really early cause my mother had been using it since she was 3. My friend heard me and told the teacher, a nun, who pulled me aside and said cursing is never, ever, okay and that it’s taking the lords name in vain even if you don’t say Jesus or God or whatever. Also said Dammit was one of the worst ones.

So I agree with others here. The question should not be, “Why is cursing normal for some people?” It should be the opposite. Curse words are just words. They don’t have power like religion states. They’re just words. To whomever doesn’t curse, stop letting just words have power over you. They don’t fucking matter.