What percent of people do you believe are genuinely evil will negligible redeeming qualities?
This does not ask whether they are born evil, but the way they are now.
This is by your standards instead of theirs. A racist might think they are completely correct and surperior to other races, but most will find these beliefs very harmful.
Someone can HAVE redeeming qualities but with those qualities being negligible. A serial killer giving a beggar one dollar, for example, is almost entirely outweighed by the fact that he is a serial killer.