Disabled people should not be discriminated against. However, behind increasing numbers of disabled, is the rise in false claims: you can have rigorous detection or universality depending on your politics.
Both are expensive and do not target funds to the disabled, because if you assume the year on year growth is down to false claims then penalising the disabled is not the solution.
Education does provide a return on investment so it is worth doing, always. State-run family planning however seems to have a terribly high cost. I am all for reducing the world population but there is no reason to dictate to evolution.