No doubt what people are saying about their own relationships is true.
There are lots of reasons people like being spanked that have nothing to do with past abuse. Thrill, adrenalin, excitement, livening up of their sex life, or even because they work so hard outside of the bedroom they enjoy the release of being able to submit inside it.
But all these things are happening within the context of a world where men are routinely using violence against women, and where groups of men exist who genuinely believe it is a man's right to use violence against women. In this context, BDSM becomes less about our personal choices in the bedroom.
It's like using porn - it might give you a thrill, but what about the women who work in the industry? What's their story?
Just because something feels nice, and works for us personally, doesn't mean we should do it.
We don't want to buy t-shirts made by 5 year olds in factories, no matter how cheap they are. I'm not making a direct comparison with BDSM, I am trying to show how the personal is political.