Good and evil has been around forever and will never stop. There is always someone/thing having evil or good thoughts. All living things have emotion that tells them if they want to do something nice or bad.
For example, if a monkey wants to steel another monkey’s banana, he could and that would be evil. If a monkey wants to give another monkey a banana, he could and it will be good. Same thing looks toward humans, but only the good and evil can be more sophisticated.