I think a lot of mums have had bad, very bad, experiences with partners who break promises, don't give them any financial assistance, use the children as blackmailing tools and so on.
It's a lot more common that way than the other way round, but I understand the point the OP is trying to make.
My brother in law, lovely guy, worked hard for his family. Had 2 little 'uns with his wife. Relationship had problems so he suggested Relate, twice, which they both attended. He doted on his kids, took his wife out for meals, arranged babysitters and she was even able to go off for a few days on her own every now and then. Mr Ideal he was. Then without warning, she told him she no longer loved him and said he had 2 weeks to leave the marital home, the house he had worked on nearly every day since they bought it and was really a work of art due to his skill.
She said he could read stories to the kids every bedtime, but she soon stopped that. He later found out she was planning to have an affair but the other guy said no.
She has told their children that their dad is a horrible dad who doesn't give her any money and would let them all starve. Yet she got the house, half his business and a substantial amount every month.
She moved house with the kids to over 100 miles away and expects him to pick them up every other weekend and every school holiday and drop them back off. She'll phone at the drop of a hat and demand he have them. He does so because he loves them and he knows what they have to put up with at home, which is a screaming, hysterical banshee who smacks them, threatens them and so on. She even said that if they said they had a good time with their dad she'd smack them.
So yes, I do sympathise with the OP, this does happen and you'd be an idiot to think it doesn't.
I don't know why women all jump on someone who points this out. It's hardly feminism to defend this type of mothering is it?