The nature of humans is to grow - this may be to grow in grace and knowledge, but this requires intent and understanding. Genesis shows us this was provided to Adam and Eve in the garden, and they were instructed by God. This capacity to grow indicates a lack at one time, and an acquiring through choice and intent as a progression. We need to get past a mechanical choice as an aspect of freedom, and instead look to intent, act, and judgement of outcome, as aspects of the human condition. The remarks re Augustine @Paul_Allen1 fall in this area.
Angels on the other hand, can only be what they were created. The sin of Lucifer was to imagine himself as greater than he was, and eventually imagine himself as equal to God - this made him an adversary, and we attribute the sin of pride to him. Thus theologically Lucifer through an act of will changed his nature into Satan.
The distinction should be clear - Adam was tempted, but Satan is the author of sin, and this is to cut himself of from God and to become, though his own will, the adversary. We refer to him as the author of sin and as such his nature is set. Humanity made a wrong choice and erred - so humanity can be saved from our error, and Christ is the way for this.