Because he wants to give his technical expertise, and does not want to enter into a political debate about the way we organise society. If you read between the

Because he wants to give his technical expertise, and does not want to enter into a political debate about the way we organise society. If you read between the lines, you can see that he understands that people have reservations (and probably he has chosen). He just chooses to explicitly not make a statement about it, and keep this a technical discussion. In todays highly politicised society, this is (in my opinion) a sensible thing to do.