The problem with the Hitler's ideology was not that certain races have better abilities than others, but rather that Hitler took everything to an extreme. Scientific research proves that races are different genetically, in that they are prone to different illnesses, have different heights, etc. Now what does this means? It means that people of Bantu heritage have a higher capacity to be good runners, while people of Arab heritage have a lower capacity. Now, this is not saying that ALL Bantus are good runners, and ALL Arabs are bad runners; obviously there are cultural, habitual, and familiar influences that lead to the success of a runner. But there are obviously certain skills in races that other races don't have. This is simply the mode of evolution.
Let's use dogs as an example. The Fox Terrier is a small dog (usually no more than 17" to the shoulder) with a long snout. The purpose of the dog is to catch vermin. Breeding and evolution has made the dog adapt, and so the dog has a higher capacity to be a skilled vermin hunter. However, the Irish Wolfhound (my dogs
) is a very large dog (mine are 30" and 32" to the shoulder, I believe), and obviously isn't going to easily be able to catch vermin because of its large size. However, the dog is excellent at hunting wolves, because of its large size. Once again, this is not to say that all Irish Wolfhounds are good wolf hunters and all Fox Terriers are good vermin hunters. My Irish Wolfhounds have never seen a wolf, and I’d imagine they’d run away from the wolf if they ever saw one, and become prey instead of predator. Meanwhile, I’m sure many Fox Terriers could become excellent wolf hunters (though highly unlikely, possible). One again, familiar, cultural influences and habitat can change anything.
Hitler’s ideology is simply a perversion of this fact. I don't like to use the term "race" unless nessecary because I simply don't believe it exists. However, I believe that people living in habitats do exist, and adaption determine one's skill.