There's also a "laziness" factor whereby dropping F bombs left and right starts to feel like a cop out vs thinking of some cleverer ways to articulate feigned outrage.
It's this reason, more than any other, that's brought me to clean up my language as I've gotten older. Calling someone a motherf* is easy. Being able to point out their promiscuity would make an 18th century French libertine blush, now that takes, if not skill, at least the effort of reading some 18th century French libertine literature.