I don’t think the quote from TR is evidence of racism. I believe when he speaks of “degenerates” he is referring to people with birth defects or who are mentally handicapped. That said, I could be wrong. Eugenics is evil stuff and we know Margaret Sanger wanted to wipe out as many black babies as she could.
And it was the (liberal icon) Oliver Wendell Holmes, Jr., who (IINM), ended his concurring opinion in a case upholding a state’s forced sterilization of mentally handicapped women, “three generations of imbeciles is enough.”