I want kids, but I will probably never be able to have them. I can barely take care of caged pets. If I'm ever able to care for kids, I will probably adopt some through the foster system.
My baseless hypothesis about this is that people are more likely to say they don't want kids if they've got something that makes them "weird" compared to their culture of origin (autistic, gay, mentally ill, etc), because a lot of people feel like they have to want kids or they're supposed to want kids, and it's practically taboo to not want kids. But once you're already weird, it's easier to add more weirdness to the pile.
By the way, you don't need to be in a romantic partnership to have kids. (After researching the matter, I'm pretty convinced that most of the anti-single-parent ideas out there are total myths.) Although, it's more challenging in some ways, so it may be too hard for disabled people.