I don't think it ever actually promoted eugenics. It just explored the natural consequences of two facts in a comedic way:
- Intelligence has a hereditary component to it.
- Stupid people have more kids.
It never tries to push any eugenics-based agenda. It would have if they tried to say that dumb people shouldn't be allowed to have kids, but they never went anywhere near that.
I don't see how it could be scumbag. Fear of sharks != fear of people in very obvious and unrealistic shark costumes. People who are afraid of ghosts don't have panic attacks from seeing people in ghost costumes on Halloween.