In the beginning of the human race there was no genetic load which would cause undesirable traits such as appear in offspring of marriages between relatives today. ↗
When a man sees something desirable, he must reflect on the fact that with time it could come to involve what is detestable. When he sees something that is beneficial, he should reflect that sooner or later it, too, could come to involve harm. ↗
My own view is that this planet is used as a penal colony, lunatic asylum and dumping ground by a superior civilisation, to get rid of the undesirable and unfit. I can't prove it, but you can't disprove it either. ↗
The problem with the designated driver programme, it's not a desirable job. But if you ever get sucked into doing it, have fun with it. At then end of the night drop them off at the wrong house. ↗