To hear about it and to then decide "this absolves me of any guilt, because I couldn't have done it any differently" is also a choice your process made. Counterfactually, it could've made the opposite choice (though it didn't do so).
Now, me pointing this out presents yet another choice and opportunity for change. And these opportunities keep happening for the rest of your life.
In essence, even though you cannot change your actions in a very deep sense, concluding "I can't change myself because it's already determined" is always a premature conclusion, whenever it is made.