So they don't enjoy dominating and controlling, but then you go on to explain that they do enjoy dominating and controlling, but only because it's hot. Righty-ho.
And sadomasochism never has anything to do with pain? Pull the other one, it's got bells on.
People who have not been brutalised to some extent are simply not willing to simulate abuse - it is abhorrent to any well-adjusted person. A man that can experience sexual arousal or even avoid disgust while pretending to be an abuser, especially to someone he claims to love and care about, is dangerous.
I absolutely see masochism as a form of self harm. Punishing yourself isn't the only reason someone might engage in self harm. Apparently cutting yourself also produces endorphins and can feel good and release tension. It's still not healthy behaviour even if it feels good. I do not class masochism as immoral at all. I believe that ideally masochists should seek help, but if they don't want to I don't care as long as they don't go around telling young people how normal it is.
Sadism on the other hand is unacceptable and I hold sadists in complete contempt. Whatever issues they have they should find another way of dealing with it.