The account of the Fall in the Garden of Eden is really a story about how mankind deals with what they perceive as evil in others. The Tree of the Knowledge of Good and Evil represents the standard, historical approach used to address what we consider as evil human behavior, namely condemn it and combat it violently. This was the response to sinfulness/evil under the OT law, and this continued unabated until Christ came and taught a new way- overcome evil with good.
The Fall led to the Law which then led us to Christ (Galatians 3:24). The Fall was the first necessary step in a spiritual progression which ultimately turned the wisdom of law keeping on its head. Evil is not addressed by defining it, noting it, and coercing others. It is overcome by displaying its opposite, not by practicing evil as its own cure.