Daft is usually a pejorative, it isn't however ableist that's just crybaby bullshit you're using to try move the conversation into culture war bullshit instead of the actual conversation.
Quite literally the exact reason it's not a science. Science is evidence based l, objective and repeatable. You're implying at some point without any evidence whatsoever that we could end up finding everything is objectively provable through what I can only assume is psychohistory which isn't likely our at all reasonable to assume. The fact the argument started as questioning if morals have weight is just more evidence that social science could never exist only social sciences. Ie. Sciences that relate to society not the science of society because that isn't a thing.