If it makes you feel any better, and it probably won't, probably many of the same people do the exact opposite thing to people with serious disabilities. I've heard so many horror stories of people with disabilities who choose to have children and then get hell from everyone around them. So, I bet a lot of the people who would argue that a childfree person is somehow being bad would also argue that a disabled person should remain childfree. Basically, other people want to decide who does and doesn't reproduce, and for some reason think they should have a say.