In some cases, lack of full knowledge or holistic view, that is also part of the problem. But mainly lack of moral principle. So long you have this genuine sort of concern, well being of other. That's the foundation of moral principle.
We have a largely materialistic lifestyle characterized by a materialistic culture. However, this only provides us with temporary, sensory satisfaction, whereas long-term satisfaction is based not on the senses but on the mind. That’s where real tranquility is to be found. And peace of mind turns out to be a significant factor in our physical health too.
Evil is the vulgar lover who loves the body rather than the soul, inasmuch as he is not even stable, because he loves a thing which is in itself unstable, and therefore when the bloom of youth which he was desiring is over, he takes wing and flies away, in spite of all his words and promises; whereas the love of the noble disposition is life-long, for it becomes one with the everlasting.
He who has attained intellectual emancipation to any extent cannot, for a long time, regard himself otherwise than as a wanderer on the face of the earth and not even as a traveller towards a final goal, for there is no such thing.