For the vast majority of people, “Profanity” is just a way of speaking they have fallen into, because everyone around them talks the same.
“Environment”.
I don’t really believe in this thing known as “Tourettes”. The only reason that some people “uncontrollably swear” as if it was hiccups, sneezing, or yawning causing it to happen - is because they’ve not been corrected on how offensive swearing can be, if used out-of-context, and among more polite society.
F— me, I said all that without swearing once!