It's not a "conspiratorial plot", no. But time and again, research has shown that the implicit biases held by the people building these tools [0] are observable in the tool's results — and all people hold implicit biases.

It's not the tool we need to debug; it's us.

[0] Where, by "these tools", I mean machine learning writ large.

EDIT: I highly doubt your comment's parent was suggesting we had to be irrational in order to be ethical. Rather, I believe they meant we should be rational and ethical. Wouldn't you agree?