That is because people don't know that he was a nut and believed in eugenics......if more people knew that Teddy wouldn't have the status that he has.....
1) A lot of prominent people accepted the science of eugenics in the early part of the 20th. It's not like he believed Obama was a Kenyan Muslim sleeper agent sent here to destroy the United States or that Bush caused 9/11.
2) Eugenics is simply improving the human race through selective breeding. Eugenics got a bad name because of it's association with the fucking Nazis. Not only did they selectively breed their "best", but they actively sought to eliminate all "undesirable" human beings from their population such as Jews, Homosexuals, mentally defective, Gypsies, etc. by imprisoning and executing them. 11 million people died in the Nazi Holocaust, 6 million of them Jews.
3) From 1907 to 1963, the US practiced eugenics through forced sterilization of "undesirables" such as the mentally retarded, the insane and other "defective persons".
Social Origins of Eugenics
4) Today it's considered not PC to mention it even though we're entering an age of selecting desirable genes from eggs and sperm to form a desired zygote. In essence, we're on the verge of practicing Eugenics pre-conception.