One reason to be careful with that whole "Of course we have the right to pronounce sweeping moral judgement on whole eras of history" thing is that we haven't t

One reason to be careful with that whole "Of course we have the right to pronounce sweeping moral judgement on whole eras of history" thing is that we haven't the slightest idea what coming ages will say of us. And what the next crackpot who claims to be more enlightened than you or I will claim that they will, so they are just a little ahead of the curve -- but obviously right, of course! -- in condemning you or me, personally, for whatever moral position we hold obviously just and right.