In the category of "general" today we have twenty examples of "bad opinions" from the "bad opinion generator" at "The Week." No argument on their badness. Only I question whether they're "opinions" or not. Some, nay most, of them are horrible predictions:
"Albert Einstein (the little boy) will never amount to anything."
Others are just likely false propositions:
"This virus [AIDS] is a pussycat."
So maybe it would be helpful to sort these into categories: wrong predictions, wrong evaluations, false propositions, etc. Categories make lives easier.