One of the main themes in Blade Runner was the ambiguity between humans and replicants. There were many times in the movie where the line between the two was very blurred. I thought it was interesting that the "bad guys" in the movie were the replicants while the police and Deckard seemed to be the good guys. It was asked in class if anybody had sympathy for the replicants which I hadn't really considered before. But after thinking about it, the humans appear to be just as wrong or evil as the replicants. After all, the humans designed the replicants to be slaves in the offworld colonies. Everyone would agree one human enslaving another is inherently wrong, so I don't understand why the replicants are so human. Not only were they made to look human, but their designers also implanted memories in some to try to make them act and feel as humans. To me, this is an evil and unnecessary act in itself. Slavery is a dehumanizing institution, so the humans are at fault for trying to make their slaves seem as human as possible. Not only this, but if the slaves try to escape then they are executed, which is called retirement. This is a euphemism which just further dehumanizes the very slaves they are trying to make more and more human. In this sense, the replicants are justified in their attacks on humans in my mind.
I guess the point of my rambling defense of the replicants is that just like the lines of human and replicant are blurred in the movie, so are the lines between good and evil. Although the four replicants are portrayed as pure evil throughout the movie, the actions of the humans are equally reprehensible. This is could be further evidence towards the argument that there is no real difference between humans and replicants, other than lifespan of course.