I did start out liking this show a lot but the constant swearing sort of got old for me. I know they say this is supposedly how it was but I am not so sure that it was this way having done a lot of research on this era. People back then still had religion and this meant that they tended not to blaspheme as easily as we do these days. This was in honest fear of their souls, even those who lived in sin tended not to tempt fate and call out God. They also had a healthy respect for the way they spoke around women, even in these sorts of rough camps. Not the whores so much but once folks had wives and such showing up, the language would have changed quite a bit in town simply out of respect.
I am no prude. I now and say most of these words myself, though I don't blaspheme. I know that a lot of folks do though and frankly that is fine with m e, I am not going to tell them to stop it. Where I draw the line is when it is done for simple "shock" value which is what I sense is why they do it so much in this show. They know it is a part of why the show has become so popular, people kind of like to hear these folks curse like this constantly. It has a sort of, well, shocking way of assaulting their values and they like this and are drawn to it. Like "Shock Jocks" on the radio saying and doing the most outrageous things they can possibly think of just to make people laugh. I guess I don't find it so funny. YMMV and I am not preaching, just my two cents.