Most things in life aren't quantifiable, unfortunately. In our field we're spoiled by how many things can be reduced to numbers, but when it comes to interactions between humans it's essentially impossible. So instead, we have to use subjective evaluations.

My subjective evaluation, having met RMS in person and looked at the consistent patterns in his behavior, is that he is "below replacement value" -- he has overall caused far more harm than the average person in his position would have.