Sentience is literally the thing that defines our experience of the world. It's irrational to dismiss it as "Oh, that's nothing. Don't worry about it."
It may well be "a semi-random by product of natural laws and processes", but that's a hand-wavey non-explanation.
Whatever the details are, we're so completely ignorant of them we can't even hazard a reasonable testable hypothesis about how exactly natural laws and processes create self-awareness.
Saying it's a non-problem because "obviously" it just is, is the opposite of science.