Also as a dad I fully agree with your other point - I want to spend time with my kids as well, and I bristle at the suggestion that my kids are my wife's 'problem.' I love my kids, and if I had the means I would spend all of my time with them. But considering the reality that one of us has to work so we can eat, I've found that it's easier on me emotionally to spend time away from them than it is for her. Maybe that's not widely true, maybe it's nurture over nature, maybe it's something else entirely, but it's something that exists and maybe shouldn't be absent from these discussions.