>You and some others are contradictory here. Who rationalizes what?

>If brain is just a matter interacting and produces output based on computations inside itself, who rationalizes that afterwards?

>There is no one out there. It is still the same dead matter interacting and nothing else. Lifeless atoms do not need to explain anything.

There is nothing contradictory here at all. If you want to insist that the conscious self is also an illusion, then that only makes it necessary that conscious choice be an illusion.

Our brains developed extra capacities that allowed us to be able to store new and complex, even second hand, experiential information to supplement our inborn instincts for processing during the subconscious decision process. Consciousness seems to be an emergent property of this additional storage and computational hardware. Apparently it tends to increase survivability, otherwise the pre-conscious step in human evolution would have won out.