As someone who is prone to an f-bomb on occasion, I think the real issue is, pardon the pun, knowing your audience. I know for me, watching "reality" TV where every other word is a bleeped F-bomb is a real turnoff, and I absolutely judge the person for their lack of self-control, because that's what it is. A lack of self-control. I know for me, I don't swear at work, and I have never once, ever, dropped an f-bomb in front of my mom, and only once or twice in front of my dad.
I note that I've seen Paul Stanley multiple times with makeup and without. With makeup, his raps are very much in the "I wanna rock!" vein, with few swear words (on occasion, but rare). Without makeup, in the 80's? His raps were x-rated and on some nights, even I was like "Paul, tone it the f*** down". I think Paul knows/knew that his audience wasn't the same. Now, there are a TON of kids at a Kiss show, and he acts more appropriately.
I also think there's a difference between "live" and "on DVD". He could have very easily excised the f-words from THAT PERFORMANCE, and not been any less aggressive, authentic, or "rock and roll". Phil Collins used to regularly drop f-bombs in Genesis shows (even changing the lyric to "Invisible Touch" to "f*** up your life") but for the several live DVDs? I think there's one case where it slipped through. Maybe two.
For me, I don't care about the word, as much as what is the message it sends? It seems to me, no matter what Derek said in the run up to the album, they want desperately to be Van Halen circa 1984 or Yngwie Malmsteen circa 1987 more than they want to be Yes circa 1974, or Dream Theater circa 1997.