This is the essence of the RTD movement. Numerous safeguards would be carefully drawn to prevent abuse, the process would be regulated by the state and by appropriate professionals, and violations would be prosecuted under the law. Unyielding fences guaranteed to prevent anyone's slide down a slippery slope. Word even went around that abortion was allowed only in the early stages of pregnancy. As it has turned out, however, abortion can be performed legally right up to the birth of a child and some use abortion for sex-selection or birth control.
Eugenic abortion is justified as being a kindness to defectives.
See where we ended up after being told that only if the mother's life or health was threatened would her life take precedence over her baby's. Hitler did not start out killing Jews, but people with disabilities. In The Netherlands euthanasia began as strictly voluntary. Now, more often than not, the doctor decides whom to kill. Even the status quo leaves much about which to be alarmed.