reasonable people disagree on whether some things are positive or negative value.

IA is one of the go-to examples for that. is it good to make every book ever written freely downloadable (as they were trying with their library project a while back), or is that bad? you and i might think the answer is obvious. we might even agree on it. but we would occupy a rather different world if even a supermajority agreed on that question, in either direction.