It could construct a world far more just and abundant. It would have thousands of options of what to do with the universe, trusting that it will spend time space and energy creating a human utopia is a matter of faith
It’s similar to the No True Scotsman fallacy: any bad outcome due to AI could be dismissed as “well no aligned AI would do that”. Alignment becomes an asymptotic north star which very well could be theoretically impossible, but would be impossible to know whether it was.