I did read once that humans basically evolved to handle childcare as a society. Apparently villages used to raise all the kids together. So I am probably arguing against biology here.
I'm still not sure assuming that people with kids have less time left over is discrimination, but I am probably projecting my own lack of desire to have kids onto the separate issue of how society should be run.
On that, you are right. It's incredibly frustrating for many trying to raise a family in Western-style living arrangements being so separate from their extended families and community. Child-raising is most efficient when done by a group: alone, it's exhausting and challenging and it's bad for the economy in the long term:
http://www.historyfuturenow.com/wp/why-the-nuclear-family-ne...
Even if you don't care about the emotional aspect, there are many impacts on society caused by the very recent rise of the Nuclear Family.