Taking away someone's ability to reproduce is essentially taking away their right to be a creature on this earth. Reproduction is one of the basic necessities of life, and taking that away from people is unethical. However, I somewhat agree with MasturDbtor on the idea that people who have consistently demonstrated they are unfit to parent should not be allowed to raise children. It is unfair to allow someone to have parents who will greatly diminish their chances of a happy life as well as the length of their life depending on how bad they are treated. Abuse should not be tolerated and neither should the inability to raise a child. Therefore, if the person is unable to raise the child because of quantifiable reasons such as the inability to provide due to disability or the lack of mental maturity to handle being responsible for another human life (severe autism). However, the ability to reproduce should not be impeded by the government. That WOULD be in the mindset of Adolf Hitler.
Ah yes, sterilization of the disabled to create a stronger race: the rhetoric of Adolf Hitler. Though it may be a wise decision for such individuals to avoid procreation and instead adopt if they really want children, this is not a liberty we can strip from the people. It also gives the government the power to decide who can and cannot reproduce, a dangerous power to grant. As far as blindness, deafness, missing limbs, this is absolutely ridiculous. These are usually not inherited from parents.
I understand that we should give equal opportunities to people with disabilities. But from a eugenics standpoint, it is not appropriate. Even adopting kids is not good, because it can be very challenging to raise the kids with a physical disability. A physical disability can be epilepsy, cerebral palsy, or muscular/skeletal conditions, such as missing limbs. Kids are very expensive to raise. A disabled person might have problems finding employment, and this can affect income.