These murderers were once normal people like you and me. But they have been corrupted by allowing the seed of hatred to grow and fester in their hearts. They have turned from all that is good.
We must not and cannot allow that same seed of hatred to take root in our hearts.
We must not look at our neighbours of different skin, different religion or different political beliefs and allow hatred to grow in our hearts.
The only revenge that we must take is not to become as they are.