Man, sometimes people are so desperate to advance a point of view, they end up a million miles off base. Carl Icahn didn't "force in" a new CEO, his old CEO was a freaking criminal who signed off on fraudulent earning reports. Yes, a change was warranted. He got paid over $10 million to walk, left Hertz with another $16 million in fines, and he himself ultimately settled with the SEC for just $2 million (and landed in the CEO role at Caesars Entertainment, which filed for bankruptcy under his watch, and then paid him $29 million to "emerge"). No, if you are a criminal CEO and a cheapskate, you don't get to blame Uncle Carl for making you do it.
https://www.sec.gov/news/press-release/2020-183