So then why would Soong do that? Invent an AI but then imprison it within as close to a human form as advanced science would allow? Because maybe he felt being an intelligent lifeform that exists as we do has intrinsic value in itself & perhaps in general.
For one thing, Data is perhaps much less likely to think all humans should be eradicated like V-ger or Nomad for example, because he knows intimately our experience. He can identify with us.
This is what it sounds like if you are a robot with zero empathy for human kind...
Or you know, far, far, far less than Zero empathy.