The real issue is the concept of imprisonment ought be about putting people who truly can not be trusted to be "at large". Prison shouldn't be a punishment. There are other alternatives.
possibly, but the issue is not cost conservation; the problem is that there are shareholders who benefit the more people are sent to prison. This creates perverse incentives (lobbying for stricter/longer sentencing, bribing officials, etc.).
Have you heard of the "Kids For Cash" scandal? Private prisons actively try to get more people incarcerated by bribing judges. The judges are complicit too, but the private prisons are absolutely trying to "funnel them into their pocket books"
Any system with any amount of scale will have bad actors. It’s one very bad data point, but certainly not enough evidence that the whole system is corrupt
There’s a lot of hyperbole and incentives for the narrative to sound better than it is.
Unfortunately I have experience from a family member. See it for yourself if this is an issue you care about.