I think there are many--possibly even most--"bad people" who have positive opinions of themselves. Dark triad and all that.

And then of course plenty of "good people" with self-esteem issues who will always have a bad opinion of themselves.

There should be at least a degree of objectivity when it comes to determining goodness. The bar might be low, but there is a difference between somebody who generally thinks of others (considerately) and who generally does not.