You're asking a question that only applies to rational actors.

Corporations exist for one purpose: to get as much money as possible. Side concerns, which can range from "not destroying the environment" or "not destroying the economy," are objectively not their goal, nor do they consider them their responsibility. Those are things "someone else" should worry about.

AI destroying all jobs is similar to a nuclear arms race; these companies don't want to eliminate everyone's ability to buy things, but they don't want to be the only entity without that ability, so ...

That is mostly true but a bit of a simplification. They exist to do what the people who have power want them to do which is not always strictly profit maximization.

A ceo may realize rto will decrease profits but do it anyway because it increases the power delta between him and the workers.