Yes, they don't realize it or lie to themselves because ~50% dropout.

Given the attrition, I really question if PhD programs are honest with incoming prospects. Law schools and business schools are similarly "guilty" of pimping outcomes.

ITT: it's people complaining about being overworked and mislead in their PhD programs.

A research professor typically graduates dozens of PhD students. Perhaps there was a post-war bootstrapping period where every one of those students got a tenured position somewhere, and in turn also trained dozens of PhD students; but it's pretty obvious it's not realistic to expect this to continue indefinitely. We're way past saturation right now. Certainly very few are going to get their own tenured positions, and as for the rest, it depends on the winds of funding availability in industry.