For me personally, I’ve seen some projects use swear words in thier stories to exantuate scenes and a sorta weight to them.
So as long as you properly label that you’re project has swear words, you should be good.
As for using them in supports, I’d say just try using swear sparingly in general so you can use them in other stuff. Not to say swear words shouldn’t be used in supports, but rather they could be used more effectively in the project somehwere else like the story.
2 good examples I’ve seen would be Drums of War and Bells of Beyelen respectively.
Drums of War using swear words to illustrate a previously allied unit now apart of the enemy team due to bad circumstance and the bad hand he was dealt. He says some rather insulting things, calling one of main characters a whore.
While this is a very negative word to describe someone, it does convey a sense of unbridled anger about being left behind to die. Yes, while other words could be used to convey that message, it may not come off as strongly.
For Bells of Beyelen using swear words, their comes a time when the characters confront a immortal who has used there immortality to rule across the land savagely and without remorse for others.
When questioned on why, she says that it’s just natural to use such a thing as immortality to build, cultivate and oppress others under your foot since you have the time and all that.
However, she is viciously called out by one of the main characters, stating that she’s no different from any other power hungry fool that they have known and is just using her explanation as a excuse.
They end off the sentence by saying “Kill this bitch”
Using bitch here is effective since it’s pointing out the obvious hole in the Immortal’s explanation.
Where so many individuals are so hungry for power and use that power to opress others, the immortal being the exact same, yet she should’ve had way more time to think about it, but intsead is stuck with that mindset, foolishly thinking that it’s the only mindset to have as a immortal.
So all in all, don’t use swear words too much if you want them to mean anything impactful, or just make a ton of swear words in your projects since I’m not the boss of you