I’m in the unusual position of knowing a few men who are/were single dads including my own brother, though in his case his ex died.
It’s rare but it does happen that women leave their families too and in my experience when that happens they can and do behave just as badly as many nrp dads do.
My own ex like a pp while we were together I never would have thought he’d be a deadbeat dad. He was scathing of others behaving like this and had a good example set him by his father (his mum was wife 2 no affair, ex fil married first wife very young due to unplanned pregnancy and it didn’t work out) who was more than fair to his ex wife and very involved with his children from his first marriage, they all only lived one street away from each other.
His behaviour was a total shock not only to me but to his family and oldest friends too.
But he played the victim as far as he could then several years ago he basically vanished out of dds life altogether, just didn’t make the effort to so much as text her.
Sadly too many men when they leave a relationship. Especially if there’s an ow or a very “new” woman then choose to pour all their energy into that.
Even more especially if there’s more dc. My ex has 5 with wife 2, by the time he announced pregnancy 4 to dd her immediate reaction was to burst into tears as she KNEW from past experience it meant he’d make even less effort with her. Dd hasn’t even met her youngest sibling, because her dad has never done his part to make arrangements for dd to visit.
It’s incredibly heartbreaking and infuriating!
He recently got in touch with dd and she got her hopes up but it turned out he had ulterior motives and he eventually just flakes out on her again when he didn’t get exactly what he wanted! Arse!
It does need to become socially unacceptable to abandon your dc in this way, at the moment many men who “fight the system” and get away with barely seeing their dc and IF they pay cm pay a pittance they get backslaps and “yea don’t be paying for that crazy ex’s manicures” bullshit!