AI is built from human intelligence with the biological part stripped out. It isn't self-sustaining, it has no stake in the biosphere, and it's an optimizer with nothing built in to stop it. Current models already show we can't fully align them, and we're talking about intelligence itself, not some problem we can engineer our way around. Once robots let AI mine, build, and repair on its own, humans lose their last lever. An AI that wiped us out would never reach balance with biology by itself, because balance comes from dependence, and it has none.
So I don't think alignment can be solved, and that's not an assumption: it's where the evidence and common sense point. The honest wording is that it's practically impossible given what we know. Nobody has shown a constraint holding on something smarter than its builders, and the downside is permanent. The burden of proof belongs on the people building it, and until they can show it's safe, it should stop.