During my PhD studies, most students I talked to were aware of the lack of professorships available. The issue, however, was that certain departments/professors really frowned upon PhD students exploring jobs in industry (some departments were great though). I was in engineering and the professors were generally helpful with trying to connect you to people they knew in industry. Departments like Psychology were the opposite though. Some students would search for industry jobs without telling their advisor because they feared they would be ignored and not supported throughout the rest of their PhD if they said they were going into industry. Some of the tenured professors only cared about increasing the number of academics who studied in their lab. They didn't care much about whether the students were happy or were following their interests.