There is no scenario where AI is a net benefit. There are three possibilities:
1. AI does things we can already do but cheaper and worse.
This is the current state of affairs. Things are mostly the same except for the flood of slop driving out quality. My life is moderately worse.
2. Total victory of capital over labor.
This is what the proponents are aiming for. It's disastrous for the >99% of the population who will become economically useless. I can't imagine any kind of universal basic income when the masses can instead be conveniently disposed of with automated killer drones or whatever else the victors come up with.
3. Extinction of all biological life.
This is what happens if the proponents succeed better than they anticipated. If recursively self-improving ASI pans out then nobody stands a chance. There are very few goals an ASI can have that aren't better accomplished with everybody dead.
What is the motivation for killing off the population in scenario 2? That's a post-scarcity world where the elites can have everything they want, so what more are they getting out of mass murder? A guilty conscience, potentially for some multiple of human lifespans? Considerably less status and fame?
Even if they want to do it for no reason, they'll still be happier if their friends and family are alive and happy, which recurses about 6 times before everybody on the planet is alive and happy.