I'm wondering how a truly free will can even be possible?
100% Free will is only possible if you are all-knowing (omniscient) and free to decide based on the fact.
Well, the One who is most able to make a free choice, then, is God who is omniscient. But can God choose to do evil? No. Why not? Because God's nature is to do only good.
So, one's will is limited to one's character; possibly I should say more or less limited. But your character can have a lot to do with what you are capable of choosing, I would say . . . and why you are choosing it.
And then there are consequences, which you might not consciously be deciding and controlling.
So-o-o > if this is philosophically correct, what does this have to do with morals and ethics? I would say that since our character can have much to do with choices we are capable of making, we need to seek God to correct and cure us to become truly unselfish in His love in our nature.
Hebrews 12:4-11, 1 John 4:17-18
But we will need God in us to maintain us in this state, and this will mean constantly being in union with Him and how He leads and guides us. So, then our wills will be free to obey God and do what He has us choosing to do in His love > Philippians 2:13, Colossians 1:28-29.
And in union with God, we are joined into His all-knowing guidance, so our wills have an omniscient resource so we can do what is the most loving thing with every person, and know who to trust and how each person benefits the most by being trusted by us. So, to do this is the most moral and ethical thing to do, I would say
And, by the way, the knowing does not merely involve knowledge of material circumstances, but our Father guiding us in His peace with His light knows people's hearts . . . and His own heart, about all He really would please to do and share with us.
Therefore, we will keep discovering how we are able to love, while others are stuck in their worldly sort of free-willing with its confusion and frustration and being dominated by drives for pleasure, and being ravaged by unforgiveness and bitterness and hate and nasty angry reacting and arguing and complaining while blaming somebody else. This is what is happening with worldly free will which can be religious.
But people in their own egotistical wills can be very stubborn not to submit to God for real freedom. So, just forcing them to reform their activity does not really deeply help them. So, ethically and morally, I would say, we need to treat worldly people like they are free to choose, but pray for them and be their best friend by being a good example of how to be with God and how to relate in His gentle and humble and kind and caring love. And God is able to use our example to win them to loving.