No matter how many instructions you might use to create the most compelling simulation of a dragon in a video game, neither that dragon or any part of it is going to poof into existence. I'm sure this is something everybody would agree with. Yet with consciousness you want to claim 'well except its consciousness, yeah that'll poof into existence.' The assumption of physicalism ends up requiring people to make statements that they themselves would certainly call absurd if not for the fact that they are forced to make such statements because of said assumption!
And what is the justification for said assumption? There is none! As mentioned already quantum entanglement is posing major issues for physicalism, and I suspect we're really only just beginning to delve into the bizarro nature of our universe. So people embrace physicalism purely on faith.
Why not? You can do a simple add with assembly language in a few operations. But if you put millions and millions of operations together you can get a video game with emergent behaviors. If you're just looking at the additions, where does the game come from? Is it still a game if it's not output to a monitor but an internal screen buffer?