People who haven't been in an abusive relationship don't appreciate that for most of us, it's not daily abuse, or a man who takes all your money or beats you if you step out of line.
It's some lovely things, followed by
'not so good, but he's stressed at work', followed by
'that was absolutely not ok, but to be fair he was feeling sad and I have kept turning him down for sex, and was pretty short with him too, I should have backed off / I can see why he is so jealous', followed by
'Oh god, I have to leave, this has got too bad, too often' followed by
'he's feeling so bad, he knows it wasn't ok, he remembered my favourite chocolates, he's cried and said he'll do whatever it takes to make it right, and he's just like his old self again, and the kids are having so much fun, they'd be devastated in a split up, this time I'll just be a better wife, it's all good now and we will keep it this way'
And so on and on and on.
I'd be willing to bet that even some of the 'why have children with him" crowd themselves have been or are in abusive relationships but never made the connection. Most of us don't, it feels like something that happens to other people. It also doesn't help that our brains are also primed to fuzz out moments of extreme stress, and we forget what it's like not to walk on eggshells.