I always felt this. You can avoid Gigers monster by staying home but an a-moral android is (xray and cute games with sharp knives aside) undetectable and could be in bed next to you.

It's the underlying idea of "do androids dream of electric sheep" in some ways. If you oppose androids, how do you know you aren't one? Voight-Kampf is flawed.

If they pass a Voight-Kampf you know, at least, they can fake involuntary empathic reactions. Even without involuntary empathic reactions, an android can decide to be moral and behave accordingly.