Why is it...

It started after the hunter gatherer period ended and people stopped living in tight nit communities.
When men and women moved into a house with nobody else and started raising children, the man would work and the woman would stay home, it was also the beginning of sexism towards women, happened about 6,000 years ago, prior we were equals who shared all duties

@MiraRoss

From my understanding, Mira, it's either wired into our DNA or the socio-biological conditioning. While it's true that there are some men who have a Mrs. Doubtfire affinity to parent and nurture children, quite a few don't. Men from the dawn of time have impulses to procreate then defend what is theirs, such as family or community. This doesn't include changing diapers and a host of daily care activities that a growing child needs from a parent.

Some guys do idk about yours.

Not all men are like that.

My husband didn't know how to care for our children. He lacks almost all sense of empathy and couldn't read their cries. So he focused ob the financial responsibility while I focused on the household/ parenting responsibility.

Depends on the person. The mother is naturally better/more interested than the male on average, men are made more as providers.

I was involved, especially the disgusting things, because my wife tends to get grossed out.

Mothers are normally the more protective of the parents.

Emotions

It’s not like babies come out of men. In other words it’s been in our nature for millions of years of evolution. Animals are the same way.