There's nothing you can do about it, even I think there is something wrong with people who disregard their biological imperative.
People do what they want, but they're going to pay for it sooner or later. I've seen older men and women with no family.
They're usually extremely bitter and in the end, yes, dangerous somehow, as they have nothing to lose. So I understand why the employers would be concerned.
I went to a company this week (yep, I'm also cheating on my company, oh my god!) and they said they were very conservative and that they want men with values.
That meant: no tattoos, no piercings, no smoking, the desire to build a family and to have children.
Their company is extremely successful and growing like crazy, this is no coincidence in my opinion.
Do I sound like a nazi here? Anyway, put yourself in the shoes of these employers, you'll understand their worries.