Evil will vary with the eye of the beholder.
Evil is what I think is bad. I'm not required to explain why because it doesn't matter why. It only matters you understand what I mean, not why I feel that way, unless I wish to expound. If I say all snakes are evil, you know I'm not fond of snakes but it's not a complete description of the critter.
Evil, like any other word, is used for communicating a thought. It's legitimate because it conveys my opinion or feeling about what I'm calling evil. Evil doesn't have to have an exact definition like mile or apple. Evil is descriptive like high or big.
Everyone can make a list of what they feel is evil, but everyones list will be different. You could substitute the word bad for evil, but I'd put it on a different rung of the ladder.....badder than bad.
Oh...wait...these days bad might be good.....or bad.
