Your argument is not really responding to his.

He has, and has had, a specific moral philosophy he follows. When he took the job the public (and once he started, internal) words and actions of the company fit within that philosophy (or closely enough). Now the company has changed and they don’t fit. Further, the obvious changes happened without any real notice or explanation.

It seems reasonable in that situation to leave. FWIW; I was in the same situation, and left.

Do you fault him for his personal moral code? He is not telling you how you should act.