let us conduct a test, shall we?
"you're so dumb!" "You're so f---ing dumb!"
"pick this up!" "Pick this sh-t up!"
Which sentences have more emphasis? Thought so. Curse words give power to phrases that other words can't.
1) we naturally smell like shit
2) our brains don't fully mature until age 25 or so, which means tons of dumbass choices
3) you always have to start up the conversation or else you're a weirdo
4) we have to kill the bugs in the house. I do not want to touch that scary little shit
5) our car insurance costs much more