Megan Phelps-Roper grew up in the Westboro Baptist Church, which teaches that God hates gay people and those who follow other religions. The church also has taunted the parents of dead soldiers at their funerals.
If we allow ourselves to become so convinced that our own way of thinking is right, it can lead us to demonize other people. We all seem to be living in some version of Westboro now.
No matter how much you may disagree with someone — and even if that person is truly horrible — they are still a human being, and they deserve compassion. Treating them with kindness is the only way by which to change their mind.