Because they are 'some kind of humans', or they were. Their diet distinguishes them from us perhaps, but they can't help their needs any more than some full humans can help allergies or chronic illness.

And in any case, they are stronger than us, faster than us, and more willing and able to work together than us, considering they're in the minority. Starvation drives creatures to extraordinary feats. I wouldn't want to be you if they caught wind of this suggestion, certainly.