That said; 'evil' is a miserable accompaniment to life; and it would be nice to 'know' it's value; but have a whole lot less of it.
No one really has "free will" that is a myth..think about it.. can you choose to Fly ( without a plane :) can you grow leaves on your arms? Can you jump out a window and change your mind half way down?
All of our choices are restricted by our nature and circumstances ...