Even when two statements have the same structure, their meanings aren't interchangeable. When a capitalist says a job should only exist because it's profitable, they're asking that only the jobs they can exploit exist while others of little value don't. That's clearly not what I'm saying.

I explain further in another post

A lot of physics is done privately in the US. If physicists of all stripes were to unite and withdraw their labor then capitalism would have no ability to do R&D. The astrophysics and particle physics are a very small part of the “physics industry.” They could brain-drain capitalism but they won’t because they’re only materialists when it comes to nature. As far as society goes, they might as well believe in magic.

Asking physicists to strike and leverage their labor for the benefit of a socialist movement is not the same as asking them to develop iphones and drones so your billion-dollar company can turn a buck.