This is another one of those issues that boils down to "who's to say?". Who gets to say what is evil and what is good? I am afraid I am not going to be able to go with "social norms". That thinking brought us segregation and slavery. The persecution of the jews. The killing of intellectuals and homosexuals. We are now seeing the banning of gay marriage and firing of transsexuals without cause.
I do not beleive we need evil to offset good. The companion of good is not evil, it's love. If I were god, I would not have invented evil. There would be no child rapists. There would be no murderers. And if god indeed is all powerful, all knowing , all seeing, then god knows the outcome of all events. If god knows the outcome of all events, there can be no freewill. If god does not know the outcome, how could he have created it?
Evil is a term we use to describe our savage behavior as human beings. We do other nice neet things like legal killings of people such as executions and wars. But heaven forbid you kill someone for non political reasons without permission from the government and church. We use it to describe how those who are without will steal when the means to aquire such things are controlled by the elite wealthy, the state and the church who are all holding hands.
Evil was created as a means of control. It's nothing more than a label of something that resists the control of the state, the wealthy, and the church.
NO, we don't need evil.
Love always,
Elizabeth