Venerable Milarepa said,” There is no point in creating extra harm to poor sentient beings.  They are already drowning in the suffering of samsara.  There is no need to kill them, so many die naturally every day!  I am the real hero!  If you wonder why, it is because I won’t bow my head at the feet of self-grasping ignorance.  I fought with it, finally gained victory, and banished it.  Now, I remain nurturing my parents-sentient beings with love.  If you want to be a real hero, follow me! ”

Quote from Milarepa in  Precious Teachings, by Khenpo Karten Rinpoche, page 63 in print version (69 in PDF version), “Essence of Buddhism as Related to the Four Noble Truths.”