Parents I've contacted who have special needs children are the ones pretty likely to stay home with the child. For example, there are people who have one parent at home and can't get any funding until they put the child into any institutional care for even a few hours a day, and that's when the funding comes.
They are actually sacrificing an entire income, and special needs parents should be funded for at-home care. It's like the case with those of you who believe in funding at-home care for hospital care. It's inconsistent to say we shouldn't give money to parents of special needs kids at home.