If i have a car accident and need to have organs removed to save my life, someone will make that choice for me as i dont have the capacity to decide.
Emotionally i believe that yes, druggos should be stopped having children. I hate that they bring children into the world they dont care for. Logically i know that will never happen as there is always the opportunity for those persons to no longer take drugs and be functioning. A person with limited mental capacity cannot change their situation.