I also think it's a mistake to get sidetracked into the "what about absent mothers" debate. They do exist and they also deserve shame but 92% of single parents are women. That's one hell of an overwhelming majority.
Furthermore, I have yet to meet one genuine case in my own life where a mother has refused a father access to a child purely out of spite. I'm not denying they exist because the spectrum of human nature being what it is, it is bound to. However, again, they are a minority. Most single mothers I know would bite their XPs hands off for some extra contact and some time off.
OTOH I have come across quite a lot of men who claim the mother has stopped them from having contact. They often sound very plausible too and come across as nice guys. When you probe a bit deeper however, you often find that what they mean is they turned up when they felt like it, refused to commit to a schedule, often let down the child and messed up the mother's plans. When she then insisted on setting a firm schedule, because she is fed up of seeing the disappointment on her child's face, the father accuses her of being inflexible and unco-operative. If he then has to miss contact because he's arranged something else on that day, it suddenly becomes the mother 'blocking contact'. The point is that if he was reliable and consistent in the first place, most resident parents (who are desperate for a bit of time to themselves) would be more than willing to be flexible on the few occasions where something came up.
Then you get men like my XP, who was violent towards our DC, who has supervised contact only but prefers to go round telling people he can't see his DC because I won't let him. He puts on tears and everything.
Of course, I'm stuck in with no money and all the responsibility so I can't inform anyone any different (plus I don't care what other people think and I don't want to go to the pub all the time).
The point is, whatever contact arrangements are or are not in place, whatever has happened between the parents, whoever is right or wrong, the children are blameless and have the right to their parent's support financially, practically and emotionally.