Thanks for the sweet post.
Nonviolent communication is wonderful! Its why i do try to do this. However unfortunately does not work for everyone. There is a % of the population who have no real remorse for hurting others and feel no pain or empathy. They also tend to be very charming and able to come across as totally genuine.
These tendencies tend to be markers for a disorder known as "psychopathy" and one cannot nonviolently communicate with these people as their lack of empathy makes caring difficult if not impossible.