Why do conservatives claim that Hitler was a leftist?

[loyalsister]

79. America in the early 20th century

Also had an extensive eugenics policy with an unholy alliance. Right wingers and progressive groups supported eugenics for different reasons. The right wingers wanted to create a "Nordic Superior Race" and progressives wanted to keep people from suffering. Some in the middle supported the practices because they believed that the targeted populations (immigrants, people with various disabilities and people believed to be of poor moral character) were a drain on society and the common good.

Americans who came from "proper" backgrounds were encouraged to practice positive eugenics to reproduce (with each other) as much as possible, while marriage restrictions were enforced to limit the introduction of bad genes into the preferred race.
Progressives supported the practice of negative eugenics where they tried to limit the perpetuation of bad genes through forced sterilization and marriage restrictions, based on the idea that children should not born into conditions where they would suffer.

One supporter of American eugenics complained that "Hitler was getting ahead of us."

Once again, the good old days weren't all that good.