I believe that everything in order to exist have to have something equivalent opposite to it
So if there is good indeed there is evil
While the definition may vary according to different contexts or status we need to define evil with, also ones may have different views and what I see evil another may see good
But ultimately the undisputed matters that considered evil for me are sickness and stubidity and I think stupidity is the most evil because it's not only harming you also others
And how I define stupid; is ANYTHING DISTURBING & DAMAGING