Sorry @LaLegale to have sent you merely a short tweet and having been so long in formulating this response.
I am extremely sympathetic to those who have to care for children alone. That is a very difficult task indeed. I have immense admiration for the many people who do this hard job very well.
However, at this point in time, with women struggling again for some sort of equality and fighting against misogyny, I think we have to be very careful in inadvertently suggesting a female superiority regarding the rearing of children. That men cannot breast feed is unequivocal. Other than that men can do, and often take responsibility for, all other rearing tasks relating to children and this should be acknowledged by women in the same way that we expect acknowledgement of our own equality in other areas, particularly that of paid employment.
I agree with @LaLegale that being a person alone trying to bring up children is very difficult and needs a supporting hand from us both financially and otherwise. Except in a minority of very difficult and sad cases which need all of our help, however, most children have two parents and this must not be forgotten. I also agree that a significant majority of parents on their own with children are women but there are some men also doing it without much fuss. And many more could. It is still much more of a societal issue than an issue of real choice for many men after a divorce. Also, sadly, those women who have agreed that it is better for children to live with their fathers, or for the fathers to be the primary carers in a two person household, are often treated with reprehension by other women rather than with regard for what may have been a difficult or self sacrificing decision.
There are other issues that parallel this discrimination against men as far as children are concerned, such as the recent announcement that unaccompanied children on aeroplanes must sit next to women and not men. I have also known of fathers turning up to help on pre-school excursions etc. and having mothers object to their child being in that group. This is just discriminatory and very insulting to almost all men and restates a common myth that women do not assault children. In my experience sexual assault by women is still very under reported.
Both parents are, and should be in most cases, financially and otherwise responsible for their children. (Of course I acknowledge that it is much more expensive to run two households). The state should always remain a back up in cases of hardship to protect these children. But we must always remember that it is a choice, only available in some parts of the world and in some levels of society, and not a right, to be able to stay out of paid work to look after children.
If women and men are equal this must include an acknowledgement of equality in the area of responsibility for their children both physically and financially.