Having been the grateful recipient of many a second chance under various circumstances, I do believe in giving them, too. More often than not, when given sincerely, it's a gift that redounds to everyone's benefit.

(You're right, too, about the futility of holding grudges. In fact, if I am honest with myself, I can usually judge the necessity and importance of my offering a second chance to someone based on the degree of self-righteous indignation I find myself harboring about the wrong I perceive having been done me.)