It has been explained. It just hasn't been explained in a way you like.
Welcome back Nonpareil, as I said it has been observed and the processes involved, tabulated and correlated with scientific hypothesis.
From there there are various assumptions made, which result in your certainty.
There is no independently tested hypothesis, or any sophisticated understanding of the subjective level of existence emergent in mind as manifest in humanity(other than anthropological studies, which again are observations of people).
Assumption based on observation and a reduction of subjective experience to convulsions of the physical brain.
there is nothing magical about human consciousness, and the idea that there is, aside from lacking even the most basic coherent definition as to what that magical thing might be, has absolutely no supporting evidence. It is the argument from ignorance and personal incredulity, nothing more.
Reference to magic is straw, you'll have to better than that.
At no point has a coherent, let alone compelling, argument for life as a prerequisite of consciousness been put forth. There is no reason to believe that it is one.
An argument is not required as all known instances of consciousness are emergent results of metabolic evolution. Note, I have repeatedly pointed out that I make a distinction between consciousness and mind, consciousness is metabolic, mind is self conscious processing of subjective abstractions.
Nonsense, until materialism provides a thorough description and explanation of a genuine ontology, a rational person may freely consider alternative ontologies.
Artificial intelligence. Fascinating field; look it up some time.
Not being snarky, by the way. It's truly staggering the kinds of things that have been done with it.
Quite, I am not disputing the processes of intelligence, I am disputing the phenomena of consciousness and subjective mind.
The same proof we extend to other human beings: does it behave in all situations as if it were?
No, the proof we use between other human beings is a realisation that they are essentially clones of one life form, hence virtually identical. Plus, there is no reason for any one human being to suspect that he/she is not identical to those in their community who experience the same complexity of subjective social life as themselves.
It's right here: it's not a necessity.
Bold assumption, remember, I am not disputing intelligence, I maintain that consciousness is not as a result of computation in the brain, but metabolic.
"Where is the magic?", you mean.
Straw, I presume you are referring to the ingredient in the mix specifically requiring an idealist ontology. There is none, as ontologies which ever is the genuine one, results in exactly the same phenomena in the world. Remember that we cannot actually compare a materialistic ontology with an idealist ontology as we only have the one to work with and we don't know which it is.
Nowhere. Even human beings are just going through the programmed processes. They just happen to produce self-awareness.
Yes, just like philosophical zombies. How will we know that said AI are zombies or sentient?
Show any coherent reason that a non-organic brain should be less conscious than an organic one.
It is not a result of cellular metabolism.
We know brains are necessary. Nowhere has it been established that being made out of squishy meat bits is.
To claim that consciousness is a result of brain computation alone is naive.
We've been over this. Idealism is in no way rational. It requires you to disregard literally everything you have ever experienced, ever, in order to arrive at it.
It is coherent (well, not really, but that's beside the point), in the same way that the idea that gravity doesn't actually exist and it's all just invisible leprechauns moving things around in such a way that it looks exactly like gravity is coherent. But it is in no way rational.
These are little more than caricatures of the issue.
If the fundamental principle of your philosophy is that it looks exactly like this other thing that explains what you experience just as well, or even better, and doesn't require additional hand-wavey magical forces, you've got a bit of a problem.
I am not presenting my philosophy, I am standing in for an idealist, playing devils advocate, for the purposes of discussion.