For sure, people grow resentful and bitter. Anyone who thinks evil doesn't exist is simply inexperienced. There are people who've come to hate reality itself and the conscious experience and will work tirelessly to put create misfortune.
Charles Panzram was like this. The kind of person who'll rape 1000 people, track the dollar value of his arson, try and start a nuclear war between the first and second world. How evil changes but lesser, middling, or greater is jut a matter of degree. Evil exists.