If downvotes are used for disagreement, then I have to read them in order to know if they are relevant. If downvotes are saved only for irrelevant, one-liners,

If downvotes are used for disagreement, then I have to read them in order to know if they are relevant. If downvotes are saved only for irrelevant, one-liners, me-too's, etc., then I can safely ignore them.