Downvotes makes sense for pure flamebait or trolling.
But carpet-bombing somebody with whom I don't agree for the sake of disagreement alone is just sad.
It's easy to farm karma; just jump on the "winning" bandwagon during any polarizing discussions (usually politics, FAAMNG royal rumbles or PC vs. Mac)
Too many accounts have enough karma to downvote now, and too many perfectly valid comments being grayed out.
Maybe add another criteria like needing to be active in the last week and getting at least N new karma recently?