Plenty of people realized that eugenics was unacceptable who were in the scientific world then, just like plenty of people understood that slavery was wrong. Which doesn't take away from the fact that plenty of terrible policies came out because leaders did have those views. I don't know what left wing ideas you've seen that are wrong, I'm sure that I've seen some left wing ideas that are wrong. I'm more worried about what do the leaders and the effective speakers in groups promote. Saying that I'm making you more free by taking away your choice of library books, or your choice about medical care, that's not an extreme view that only 1% of people have. It's pretty much the consensus leadership view of Republicans.