I read or heard a quote somewhere that everyone has their dark side, but it's how you deal with it, or give into it, that makes you a good person or a bad person. In fact, I think it may have been Albus Dumbledore.
Anyway, I do experience negative emotions like everyone. I just don't want to dwell on it too much, but...
I feel like BDSM, from a submissive perspective, is a healthy way of dealing with your dark side. Exploring darker sexual fantasies in a safe, controlled way with a partner who understands these needs and can help fulfill them in a healthy way that is mutually fulfilling. The last part being the key. I want my partner to enjoy the same catharsis as a top that I feel as a bottom, to be able to get the same release from the stresses of life in a session that I feel when I hand my body and soul to Her to be Her toy. Because that is magical. It is a true catharsis, a release, to be taken to the dark places of your subconscious and to feel the powerful mix of fear and eroticism (or sadism and lust, as the case may be) with a partner whose mere presence you intimately crave.
Is it really so dark? I am into experiencing things I don't feel entirely comfortable talking about even here, much less in a group of people with more conservative sexual tastes. So I won't go into too much detail for now; although I've discussed some of it in other posts in the past. But still, there are some with sexual desires that are pathological and dangerous, not just to themselves, but harmful to others. I am not Ted Bundy, Gary Glitter or R. Kelly. Though, sadly, this isn't to say that there are some people would see my kinks as not too far off from that. So I'll conclude by saying, to us adults in tune with some of our darker side of sexual expression: Play hard but stay safe, stay sane but above all, stay consensual.