What if it's not really an aveira (sin)? When our feelings are hurt. Removing the feeling of suspicion. How "not forgiving" leads to many sins. Diminishing the severity of an observed sin rather than exonerating the person. We must NOT cast aspersions on adults, and especially not on kids. Anger at the aveira, not the person. Does the person know the seriousness of the aveira? The terrible aveira of condemning another group, another shul, another culture.