Large part of the issue is Tesla started cutting prices on new cars, leaving Hertz in a lurch trying to sell used cars at reduced. It fact Hertz CEO slammed Musk and broken promises which included(lack of better word) the reduced price of new Tesla's was killing them on resale value. Meaning Hertz was forced into almost liquidated prices compared to what the initial price they paid for the car knew.
AND ... repair part prices were off the wall, long delays waiting for parts too. It was a failed experiment by Hertz.
That was then and now, it seems EV sales growth has fallen flat on its face to add more to the losses.
I don't really blame Musk, his job to sell cars, it was Hertz job to do their do diligence ... like I tell someone who moves into an HOA then complains *LOL*
Bottom line, Hertz made the mistake of trusting Musk's words rather than their own due diligence is the way I see it.