The Church teaches that man has a free will (CCC 1731,1732).
However, I am curious how far the diminished or nullified responsibility would extend (CCC 1735-1737).
The 17th century philosopher Benedict Spinoza, believed that man’s free will was simply a lack of understanding about unconscious causes and appetites. Forgive me for such a long quote, but I am think particularly of this passage:
Thus an infant believes that of its own free will it desires milk, an angry child believes that it freely desires vengeance, a timid child believes that it freely desires to run away; further, a drunken man believes that he utters from the free decision of his mind words which, when he is sober, he would willingly have withheld: thus, too, a delirious man, a garrulous woman, a child, and others of like complexion, believe that they speak from the free decision of their mind, when they are in reality unable to restrain their impulse to talk. Experience teaches us no less clearly than reason, that men believe themselves to be free, simply because they are conscious of their actions, and unconscious of the causes whereby those actions are determined; and, further, it is plain that the dictates of the mind are but another name for the appetites…
As acknowledged by the Church, our actions have some mitigating circumstances, and I believe these kind of circumstances lead us to all the various habitual sins, and sins of “passion”. I don’t want to overstate this mitigation, and every sin presents it’s own circumstances, and it’s own mitigating factors.
But I believe this also extends to our actions that are not directly sinful - the way we look at ourselves and the world. And it’s only too obvious that our lives are, for the most part, determined by where we were born, who are parents are, and so on.; examples which have an indelible effect on our lives and our personalities.