Ahhh, the age-old cropping debate. It's threads like these that show me how many people actually dislike my dogs.
As for Dobermans/breeders/cropped ears/why didn't the breed just be created with erect ears.... it's a lot more complicated than that, but I don't expect everyone to have spent the same amount of time analyzing it to see how/why it's so complicated.
PS - sorry if the photo in my signature makes it so anyone can't bear to look at my response. #sorrynotsorry