If every thought - and conclusion - comes unbidden there is no means by which they can be controlled. I fail to understand how you fail to understand the inevitable consequence of physicalism is self-contradiction.
Why inevitable? Do you suppose that a process as complex as thought has a single originating source? That thoughts come from some point beyond the vast web of cause and effect in which we operate? If we cannot identify the precise origin of a particular thought or act of will, that is likely because that same thought or act of will could have come about through multiple pathways. You may well say that we are conscious of being the originators of our thoughts, but as I’ve already pointed out, neurological experiments demonstrate the strong likelihood that conscious awareness is preceded by detectable neurological activity; or you might say that if our thoughts are based on neuronal activity, then they are not, strictly speaking, ‘our’ thoughts. But that is kind of silly - these are ‘our’ neurons we are considering, not those of some other entity like us. However you consider it, ‘we’ are still the centres of the process of our own thoughts, regardless of the ultimate origins of such thoughts - whether in some perceived cause in the external world, or within the electrochemical signalling network of our brains.
Because you would be in the inflexible grip of determinism.
Determinism is a separate issue from physicalism. We are barely able to predict the patterns of weather, with its largely known influential factors; why would you imagine we should with any greater facility be able to predict the patterns of our neuronal interactions?
That is a far cry from believing that every single decision is ungoverned
and caused by physical events.
What is the difference between governed by physical processes and ungoverned? Or between ungoverned and governed by a homunculus or a resident spirit? The thoughts are an effect in the physical centre of the brain, which in turn produce further physical effects in the body and through the action of the body, in the wider world. These are all effects that constitute empirical evidence, and are thus at least theoretically susceptible to scientific investigation, not merely metaphysical speculation.
Exactly the same description applies to naturalists. You are directly aware of the intangible contents of your mind but you seek to explain them away as tangible impulses.
As I’ve explained before, this claim is erroneous since naturalism or physicalism is more of an open-ended classification than a deliberate cordoning off of different species of reality. In terms of tangibility, there are a couple of ways you could take this - physical phenomena like gravity and magnetism are intangible in the sense that they cannot be grasped or held, as in the hands, but their effects are apparent in the physical world. In the same way, thought is apparent in the physical world - we are aware of it and can observe its effects. Is the information in a computer’s memory ‘tangible’?
No one ever knows precisely what occurs in another person’s mind. If you think that day will eventually come you have succeeded in demonstrating that you are irrational! Are electrical impulses an adequate source of insight into themselves? What did Godel say about incompleteness?
I do think the day will come when we will have effective explanatory models of how thought operates. But see the above comment about the weather - we can model weather patterns and make predictions, but meteorologists are still very frequently taken by surprise. Perfect predictability is probably not a feature of any sufficiently complex system. Furthermore, I don’t see how Goedel’s theorem applies any less to a supernaturalist accounting of the mind than to a naturalist accounting.
Precisely what can justify it as the basis?
The fact that only a living thing can be subjectively affected by any decision made in relation to it.
I’m afraid your dogmatism is irrational.
I am not the one stating that it is actually theoretically impossible to understand the operation of the mind. I have yet to see you offer an explanation that overcomes the greatest weakness of the dualist’s position - how it would be possible for immaterial entities to affect material entities.
You are still assuming that thought
is no more than brain activity - which is the very issue at stake. The inability of a person to use or control the brain does not entail inability to use or control the mind. It merely means that they cannot express themselves or communicate physically. The brain is an instrument - like other organs (!) - not an instrumentalist.
Then I would suggest that the mind, if it has indeed a separate existence, is a highly ineffectual entity if it cannot work past the ‘merely’ physical incapacity of the brain. If you know of some means by which it would be possible to bypass a decaying or diseased brain and carry on coherent communication with the mind, I’d love to know what it is.