Or in another way. The fact that we do not differentiate (in terms of "life value") between mentally handicapped, or otherwise helpless humans and the rest, is

Or in another way. The fact that we do not differentiate (in terms of "life value") between mentally handicapped, or otherwise helpless humans and the rest, is a result of a separate ethical choice that regulates relations between us as human individuals. This choice does not logically require accepting the notion of any animal rights.