Evil cannot exist without Good
Good CAN exist without Evil
For Evil to exist, it must destroy, corrupt and steal what is Good. Good can exist regardless of whether or not Evil is present. Therefore there will always be Good, if Good and Evil really exist.
Can Freedom exist without Good?
Can Freedom exist without Evil?
Hmm...
For true Freedom to exist, there must be a choice between Good and Evil. However this does not mean that Evil needs to be chosen; it just needs to be available. Therefore, Freedom can exist in Good, while it never has to pick Evil and vice-versa.
Freedom is dependent on Good and Evil
Evil is dependent on Good
Go