The ten commandments are just the branches of the two root commandments : " And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment " Mark 12:30 " And the second is like, namely this, Thou shalt love thy neighbor as thyself. There is none other commandment greater than these. " Mark 12:31
If you love yourself for the Lord's sake, then you are able to love your neighbor as yourself, or else it would be hypocrisy and fake love and self destruction. And there's so much hypocrisy and fake love nowadays in this mundane world.
Personally I prefer to meet an open enemy than to meet a false friend. Authenticity is best !
So if you love yourself and you are able to love your neighbor as yourself you cannot hurt him/her for your neighbor abides in your heart just as you abide in Jesus Heart.
So to not kill is not about not killing a plant or an animal, it's about not doing any harm to one's neighbor ! My neighbor is not a plant or an animal !
My neighbor is my human friend made at the image of Jesus !
Hitler and Judas Iscariot are not my neighbors, they are my enemies ! ( yes, enemies exist ! Let's not be afraid to express the right words ! )
Jesus is my neighbor ! Peter is my neighbor ! They are my friends, my allies ! And even Ponce Pilate will be my neighbor ! if he was the only judge, Jesus would not have been crucified. Ponce Pilate didn't know what he was doing, but Jesus had something in him and He will save him I know for certain.