Earlier quoted context omitted.
I believe this kind of response is exactly the defensive, strongly held belief sort as mentioned by OP. What, specifically, is not cogent about his argument? I think you'll find that if you think about it rationally, there really is no other conclusion without invoking mysticism.
I suppose I have two points. First is that while an argument is being made, absent subjective agency on his part he is no more than a candle flame illuminating the room. The candle once lit must illuminate - it cannot do anything else. And so I grant in the sense of a flame burns, he makes an argument - but without subjective agency, while an argument us being made I’m not sure what precisely we mean by he. Second ab…
Your rejection on the basis of my claim that none of us have free will is logically unsound whether we have free will or not.
> Second absent free will, truth seeking has no more transcendent meaning or inherent value than a fly’s turd seeking. Love, wisdom, justice simply are, and are no better or worse than hate, ignorance or cruelty.
I agree with that. Nothing has any inherent meaning or value. The meaning or value in everything is merely the value we subjectively assign to it. That does not remove that value. The subjective experience is just as good or bad whether or not it's based on values we've merely assigned to it without any choice in the matter.
To me this notion that we need free will to value the feeling of freedom or the beauty of love, wisdom and justice is bizarre. The experience is the same whether or not the underlying choices are free or purely deterministic.
I'm a hard determinist, materialist, atheist, yet I spent a large portion of my youth writing goofy sentimental romantic poetry - the two are not in conflict; I can recognise love is a biochemical reaction following a chain of deterministic events and still feel it.