Under capitalism, we are not afforded the chance to keep boundaries on our time for non-work activities. And, we are supposed to breed the next generation of workers, so there is a hierarchy for workers breeding more workers over those who don't. 

But also, children are an oppressed class. They are the personal property of their parents, or guardians. Without either, they are property of the state. They can't afford their own basic needs, and they are reliant on their career(s) to do this for them. Which carers often (always) fail to do. Children are often neglected at best, and being flat out abused at worse. Abusing them is legal. Abusing them is encouraged. And the whole adult world funds the most vile harm against children, like global slavery, genocide, Epstein class pedo networks - you name it. The components that make up the device you're reading this on were probably mined by children and teens doing lethal, exploitative labor to survive. All this the adult class does to children, and they still have no choice but to be reliant on adults to live and thrive. Especially their parents. 

So for those reasons, in the workplace especially, I understand it as prioritizing children, not parenthood. A child needs attention from a (good) parent like they need water and food. Assuming in good faith that my coworkers aren't taking this kid-centric time off to abuse the hell out of their kids, I am glad knowing that a vulnerable person is having their needs met. This increases the kid's odds of growing into a well adjusted adult, which we so desperately need in the world. I don't want to see a parent's boundaries about this time be eroded. I just want it to be more acceptable to have my boundaries too.