I have not read the other thread as it is way too long.
Pure determinism is an inevitable consequence of the principle of causality, which is a principle I think the Buddha thaught. However, only a person completely aware of the laws that run the universe and what the present state of the universe is would be devoid of choice. Anyone who is not in this condition is unable to completely understand the causes that made him act in a way and therefore has the illusion of choice. The conclusion is not that one should not care for one's actions because all is predetermined and choice is an illusion. The conclusion is that we should care for our actions because that illusion is the reality to us and we got to make the best out of our reality.
He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.'
(Jhana Sutta - Thanissaro Bhikkhu translation)