One of the most beautiful experience one can have and the best part of one’s existence is being a parent. The Almighty has given the gift of bearing a child to the females in most living beings. Scientifically the reason for this is - in most cases females have more capacity to bear pain, they’re more balanced, they have more empathy, they have the capacity to bring a whole new world to life as they’re selfless, they’re strong physically mentally emotionally to take care of themselves as well as unborn child and child once it’s born.
At the same time, a woman is given this gift only along with or in conjunction with a male (in case of natural birth). Of course now science is advanced and makes/females can adopt, there is IVF, surrogacy, etc. but I’m ignoring those for now. This is probably natures way of saying both are needed equally for a child’s happiness and well being. Both bring in different aspects of life which are equally if not more important in a child life.
Women usually tend to end up doing more for kids as it comes naturally but many times males also equally pitch in regarding everything about the child. As said before since usually women tend to have more empathy, it is natural for her to share this beautiful feeling with the father of her child. She tends to be the bridge if there’s a rift between the two and vice versa if there’s a rift between mother child.
Personally in my view, if this gift is used to bring out the worst in you, you becoming the worst version of yourself, then it’s an insult of this gift and Almighty. Of course there are exceptions - if either parent is violent/is prone to too much alcoholism or any other major reason, then keeping child away from that parent is in the best interest of the child. But if that’s not the case, then it’s nothing short of cruelty if one parent is entirely wiped out and his/her existence in child’s life is completely replaced to the extent that the parent doesn’t like to see them together for even for a moment.