There is another, central evil that comes from using 4-letter "cuss words" like "a", "an" and "the".
i.e., cussing like a soldier, sailor, truck driver, or loading dock worker.
And that is:
If you use these words when you're happy/sad/bemused/worried/calm/excited/ and hundreds of other times per day, then what do you do to show those around you that you're REALLY upset? Do you resort to blasphemies against God's Holy Name? Or what if you commit such blasphemies out of habit as well? How do you "blow off some steam" by uttering a socially inappropriate phrase? If there are none, the ONLY CHOICE LEFT is actual physical violence. Throwing something, punching someone, getting out a gun and using it.
That is the real problem with making cussing a way of life. Just for starters, it means you have *no filter* on your mouth. What's to stop you from committing (other?) sins of the tongue?
My mother grew up in a house where you couldn't say "shut up". Her dad, when super angry and upset, might utter swear words like "hell" or "damn" and then everyone knew he was close to losing it. I can see a value in having a "steam valve" to let off steam and do something non-destructive when you're insane with anger, to let everyone know not to mess with you at the moment, so as to not make things worse.