We could but then we would have to suggest that all such choices could be that way.
If God dosen't care about any of our decisions then that definition of evil is probably simply wrong.
Of course they
could be that way. I'm just showing that evil and free will aren't intrinsically linked. There are some choices I freely make that are not a choice between good or evil. Therefore defining evil has nothing to do with showing the existence of free will or not.
God could create an automaton who's every action is determined for him except when to blink. That gives him a free choice to blink whenever he pleases or to not blink when he doesn't want to. Evil can still be defined as having a differing opinion from God, and this automaton would still have free will to the extent that he chooses when to blink, even if he can't choose to do evil.
No one has complete free will, some things I can't do because of physical limitations. So saying "free will" simply means that some choices are freely made, but not all of them. So if God limited us to be incapable of choosing evil opinions, but let us choose when to blink, we have a universe in which free will exists but evil does not.
Thus my claim, "there could be free will and no evil, so they aren't intrinsically linked".
None of that is really significant to the problem of evil, but it lays the groundwork that defining evil doesn't tell us about the existence of free will. What we want to know is whether someone can freely choose evil, but never happen to do so.
And how are we going to assuredly create such a universe? The way the story goes that's exactly what God did and humanity chose not to do that.
If God determines that humanity will not choose to do other than it's wishes then there isn't free will.
I don't think I really need to explain the "how" because I think most Christians already believe that free will doesn't necessitate evil. Many think God has free will, but He never chooses to do evil. Many think that when they die they'll go to Heaven, continue to never do evil again, but retain their free will. Heck, if there's no logical contradiction, then the simple fact that "nothing is impossible with God" should be enough.
I did run into one funny situation in this discussion before though. First the guy tells me that "No, God does not have free will. How could He if He's unchanging?" Makes sense, right? Then he says, "And when we go to Heaven we lose our free will in the presence of God". So, the ultimate purpose of life is to have free will, but freely choose to defer our will to that of God, who doesn't have free will... What the heck is the point of free will then?!