The laws of sentience

I'm constraining the laws of sentience in my own science fiction universe. I'm conceptualizing and not wording a polished version.

The principals of sentience

• one must never act to harm self or other sentients
• one must practice tit for tat with a tenth extra measure of forgiveness
• sentients disarm and uplift all subsentients to mitigate self harm
• sentience is a measure of behavior only applicable on millennial scales

These ideas lead me to question: where exactly does the Hippocratic principal of "first do no harm" fail us as humans and lead to the mass murder orgies of war?