Every place I've ever worked, there are the one or two parents that always seem to have some kind of child-related crisis and need to leave early/come in late/not show up. It's not the business's responsibility to provide part-time employment at full-time pay to these people.
I'm not talking about once or twice a year - that happens - but once or twice a month or more. Other employees now have to shoulder the load, projects get set back, deliverables aren't met, obligations to clients aren't met.
As for the two-parent income; yes, in many cases, it's required to just provide the basics. But in many cases it's wanted, just to provide the 3rd flatscreen TV, the second car, the twice a year vacations, and all the other unneccessary stuff people just can't live without.
Every would-be rider who comes onto this forum is given tons of info regarding the ancilliary costs of owning a motorcycle. People wanting kids should listen to the same advice.