It is the processes leading up to an act of judgment which require consciously driven control.
What determines the judgement?
In your deterministic scenario where every event is entirely determined by prior events, what can possibly be responsible for an act of judgement?
You need consciously driven freedom to analyse what you are judging.
Think of it this way.
1. In scenario A: a circumstance that combines any prevailing details external to you along with 'you' (which includes your subconscious traits, personal preferences and your physical/mental state at that exact time (were you hungry; did you have a headache, were you late for something etc) at that time - and you chose outcome B.
2. If you re-ran scenario A and everything was exactly the same as above (which is impossible) then it would be reasonable to suppose you'd get exactly the same result and you'd chose outcome B.
3. If you re-ran scenario A and you got a different result then clearly something was different this time and it wasn't a repeat of scenario A any more: it could be something random that you haven't even recognised that was only a factor once, or it could be a very subtle change in circumstances or in 'you' that you are unaware of that is sufficient to determine a different outcome.
Your idea that in
exactly the same circumstances you'd make a different choice is problematic since that would imply a different set of circumstances applied or that your choices are neither determined or random, which is plain silly.