A little misunderstanding (Cold Comfort)

Sometimes, we do things we shouldn't do to bring what we perceive as comfort to the people we love. We may be wrong, but we try and do our best. Even when we make mistakes, we have our own comfort that we tried. Such person is Albus Dumbledore, whose efforts, while misjudged, hold good intentions. However, Severus doesn't know and he may never grow to forgive the old man.