Is identifying with the good always a problem?

When a person or a group of people identify themselves with "the good" (in opposition to "not so good" or even "the evil" of others), quite often this can lead to "the good" getting overly aggressive in its pursuit of the goodness and de-facto turning into evil. Is this an inevitable problem arising due to identification/reification or is there a way to keep it under control and identify with the good without becoming the evil? If so, how can that be achieved? What guidelines do various Buddhist schools offer on this topic, if any? P.S. by "to identify with" I mean "to consider themselves to be affiliated with, or to be representative of, the true *something* (in this case *the good*)"