We are all human and make mistakes. Continual punishment for mistakes that one truly feels remorse is an emotional death penalty. To forgive does not mean to allow that person to remain in your life if you so choose. It is making peace with your soul and allows the offender to actually learn from their mistakes.
Abraham Lincoln helped influence antislavery. Many people didn't support his idea, however some did. I feel that Abraham Lincoln started the wave, or was the first to speak out loud, of all race wanting equality.