There's physical labor and thinking-work. As physical labor began being automated, most people could shift to new thinking-work that opened up.

Now we are going to automate thinking-work, and there is no remaining category to shift to, other than niches where people genuinely prefer for something to be done by a human, such as art and prostitution.

It's a testament to stupidity and malice, that we're about to enter a situation where perhaps 1% of people are needed to work to keep the world running and provide luxury for everyone while the remaining 99% are freed up - and our reaction is that we can't possibly figure out how to organize this bonanza, so we're all going to die or murder each other.

"They're going to cave the heads on the 30% in with rocks rather than starve to death"

Caving in the heads of the competent isn't going to suddenly make the rest competent themselves, it just ensures that everyone dies. But if this is the prevailing idea, I can see why the competent class might become opposed to carrying those who hate and resent them. One would think there's a better way.