Let's try a re-frame. This isn't necessarily how I'd prefer to argue, but it might be a more productive way to explain the point to some people.
In the United States, there are many people who are in the reserve of the military, or in the National Guard. They often need to take some amount of time away from work for regular training and refresher sessions with the rest of their unit, in order to stay ready for wartime or domestic-emergency (since they also play a large role in responses to natural disasters) duty.
As a society, we've decided this is important enough to our future security to make it illegal to discriminate in hiring against someone who has obligations as a member of the reserves or National Guard, illegal to fire them for taking time away from work to fulfill those obligations, and illegal to force them to use their ordinary vacation time to cover that time away. And even if a reservist or Guard is called to extended active service, they have the right to return to their previous employer so long as that service does not exceed five years.
We've made that choice because, for each individual employer, the temptation is strong to let some other sucker hold a spot for a Guard or reservist, and not waste any of your business' money on them. Which is a tragedy of the commons situation.
Children are similarly an issue of security for our society. There is significantly less point to building things today, if nobody will be around tomorrow. So we, as a society, have also decided that employers cannot discriminate on the basis of choosing to have children.
You seem to have a problem with the second of these. Do you also have a problem with the first? If so, how do you find a consistent position that reaches those two different conclusions?
If society agrees your employee is doing something more important than work, fine, but then society should compensate you rather than demanding you take it in the shorts (and all the ugly incentives that creates).
If you disagree that this is a useful thing, you can move to a society which shares your views.
If your attitude is purely one of "don't use any of my money to do this", well, a government-run compensation system would be tax-funded and would use... some of your money. In fact, it would probably just be implemented similarly to employer payroll taxes, so it would mean you'd get to pay into it even if you somehow manage never to have an employee who has a child. Then you could complain about paying into a system that's not paying back out to you!
Or you could just learn to deal with the price of living in a civilized society, and accept that while this may be one specific benefit you'll never take advantage of, there are plenty of benefits you do get to take advantage of, that perhaps others don't, and that they pay into them regardless.
(and that's without considering that hiring and onboarding replacement employees is expensive, too, if your policy is to fire/not hire people who choose to have children, so please be sure to consider that as one of your costs)
That's what I'm arguing for, the burden should fall fairly across all taxpayers rather than solely upon the hapless employers who ignored the massive incentives to discriminate against soldiers and parents.
In the United States, there are many people who are in the reserve of the military, or in the National Guard. They often need to take some amount of time away from work for regular training and refresher sessions with the rest of their unit, in order to stay ready for wartime or domestic-emergency (since they also play a large role in responses to natural disasters) duty.
As a society, we've decided this is important enough to our future security to make it illegal to discriminate in hiring against someone who has obligations as a member of the reserves or National Guard, illegal to fire them for taking time away from work to fulfill those obligations, and illegal to force them to use their ordinary vacation time to cover that time away. And even if a reservist or Guard is called to extended active service, they have the right to return to their previous employer so long as that service does not exceed five years.
We've made that choice because, for each individual employer, the temptation is strong to let some other sucker hold a spot for a Guard or reservist, and not waste any of your business' money on them. Which is a tragedy of the commons situation.
Children are similarly an issue of security for our society. There is significantly less point to building things today, if nobody will be around tomorrow. So we, as a society, have also decided that employers cannot discriminate on the basis of choosing to have children.
You seem to have a problem with the second of these. Do you also have a problem with the first? If so, how do you find a consistent position that reaches those two different conclusions?