C. S. Lewis, in the opening paragraphs of Mere Christianity, says essentially that humans are basically evil, but that we tend to expect good from other humans, and be disappointed and angered when we don't get it.
Who cares what CS Lewis said? Go directly to the source.
"As it is written, There is none righteous, no, not one:" Romans 3:10.
"No one is good--except God alone." From Luke 18:19
