My parents divorced when I was five. My dad wasn't an abuser, wasn't an alcoholic, wasn't a gambler, wasn't a criminal. He was a rather immature man and yes, he could be quite selfish.
The only memories I have of my mother and father together are of them fighting. When they split up, yes, we had some lean times, didn't always have the things our friends had, but we managed and my sister and I had pretty happy childhoods, all things considered.
Many years later my mother met a man and remarried. They've been happily married for over 20 years, a happiness neither of them would have found if my mother had remained married to my father. I think it's also reasonable to assume that a childhood in a home in which the parents were constantly at each other would have been a lot more difficult than the childhood I had.
You can demand statistics all you want, but I know I was better off with one parent than I would have been if they'd stayed together.
I'm not saying it's always the case, and I know children of divorce can go through some rough times because of it, but sometimes it's better than the alternative.