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

If we would have any idea about how aligment works.

I'd argue we can't align humans to neccessarily degree to ensure even semi stable future. Or nations, or corporations.

Meh, that's debatable. I don't think the problems we have require much in the way of intelligence to solve, we don't have them because we aren't smart enough. I feel aligned AGI or ASI would get crushed by the reality of humanity and the sheer strength of its inertia, just the same way aligned smart humans get crushed by it.

Intelligence isn't magic. It can only overcome so much brute force and humanity, as a non-intelligent system made out of intelligent parts, carries an ungodly amount of brute force.