Well it seems a little oxymoronish to Kill and be Kind at the same time.but being kind is the right thing to do, maybe instead of killing them they will learn to be kind also, or just be kind in return. The Golden Rule if you will.
Never have I been so sure of this as after the humane society decided to take my brother's kennel down. So many lies put out there. Breaks my heart to hear people saying what a monster he is when they have no idea what really happened.