"No intelligent human being is ever 100% clear about how to act, he/she always weighs it. Whatever we do, out very existence, our eating, living, and breathing is an injustice to some other life form, if you look at it from their point of view. If you eat, you kill, if you breathe, you kill, if you walk, you kill. So if you don't want to do all that and kill yourself, still you kill. No action in the world is 100% right or 100% wrong. You just have to consider the larger good that you create with your actions and perform them accordingly." -  "From an ancient Scripture"