Victories over ingrained patterns of thought are not won in a day or a year. - Isaac Asimov

If you start dismissing anyone or anything you want to do away with as just a this or just a that, you can destroy anything you wish. There are always categories you can find for them.

Ahora era precisamente aquel mundo frío, gris y miserable que le había parecido en un principio, pero su gente estaba llena de calor y vida. Era gente real, sólida. Solaria, Aurora, los otros mundos espaciales que había visitado o contemplado en hipervisión, parecían llenos de gente insustancial, «gaseosa». Esa era la palabra. «Gaseosos.»

Because, if you stop to think of it, the three Rules of Robotics are the essential guiding principles of a good many of the world's ethical systems. Of course, every human being is supposed to have the instinct of self-preservation. That's Rule Three to a robot. Also every 'good' human being, with a social conscience and a sense of responsibility, is supposed to defer to proper authority; to listen to his doctor, his boss, his government, his psychiatrist, his fellow man; to obey laws, to follow rules, to conform to custom — even when they interfere with his comfort or his safety. That's Rule Two to a robot. Also, every 'good' human being is supposed to love others as himself, protect his fellow man, risk his life to save another. That's Rule One to a robot. To put it simply — if Byerley follows all the Rules of Robotics, he may be a robot, and may simply be a very good man.