This teaches that they were given an easy choice; it does not prove that they were able to choose to do right since they might have been given the choice to prove they cannot choose GOD, even when it is sooo easy, so their judgement, their condemnation to damnation already, Jn 3:18, is righteous...
Deuteronomy 30:11–20 (NASB 2020) — 11 “For this commandment which I am commanding you today is not too difficult for you, nor is it far away. 12 It is not in heaven, that you could say, ‘Who will go up to heaven for us and get it for us, and proclaim it to us, so that we may follow it?’ 13 Nor is it beyond the sea, that you could say, ‘Who will cross the sea for us and get it for us and proclaim it to us, so that we may follow it?’ 14 On the contrary, the word is very near you, in your mouth and in your heart, that you may follow it. 15 “See, I have placed before you today life and happiness, and death and adversity, 16 in that I am commanding you today to love the LORD your God, to walk in His ways and to keep His commandments, His statutes, and His judgments, so that you may live and become numerous, and that the LORD your God may bless you in the land where you are entering to take possession of it. 17 But if your heart turns away and you will not obey, but allow yourself to be led astray and you worship other gods and serve them, 18 I declare to you today that you will certainly perish. You will not prolong your days in the land where you are crossing the Jordan to enter and take possession of it. 19 I call heaven and earth to witness against you today, that I have placed before you life and death, the blessing and the curse. So choose life in order that you may live, you and your descendants, 20 by loving the LORD your God, by obeying His voice, and by holding close to Him; for this is your life and the length of your days, so that you may live in the land which the LORD swore to your fathers, to Abraham, Isaac, and Jacob, to give them.”
god's word states they could
and concerning the ability to believe
John 12:40 (KJV 1900) — 40 He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.
God blinded men to prevent their belief. Why would God blind someone who had no ability to see?
Why prevent from believing those who had no capacity for belief
Luke notes had men not grown hardened they could have believed
Acts 28:27 (KJV 1900) — 27 For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.
unregenerate men are shown to receive the word with joy and believe
Luke 8:13 (KJV 1900) — 13 They on the rock are they, which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.