To the OP. You make a bunch of assumptions that aren't necessarily true.
Dooley had an ego... all coaches do. But he was in over his head in every respect and knew it early in year 2. He was ready to humble himself, take a reduced buyout, and leave after that year. The AD convinced him to stay and try another year. The ill-fated Sunseri experiment left him emotionally broken and DONE. He wasn't an awful guy who was trying to sink UT football. He was simply a guy without the talent to take on the Herculean task of fixing what was wrong at UT. His personality with recruits didn't help. He's more worthy of pity than contempt.
Jones was a used car salesman with a Donald Trump ego.... but nothing like the competence. He had one "skill". He could sell BS. He brought in a team talented enough to win the SEC and promptly mis-coached them to underperform in all 5 years. The only guy I can think of who came close to criminally squandering talent like he did is Mark Richt... except Richt is a guy you could like and respect. He simply did not have the skill as a coach of the game either in development of players or in game to succeed at this level no matter how much talent he was able to sign.
Pruitt was pretty close to Jones' opposite. (The arrogant stuff about his accent, background, et al duly noted. I'm sure all "hicks and hillbillies" that do not speak as well as the OP are stupid and lesser people too). He is a "football coach". Want evidence? He was fired and almost immediately picked up by an NFL team. Jones was fired and spent how many years as a GA at Bama? What he is not is a leader capable of being at the top of a football program. You can coach a group of LB's under someone else with his style. You cannot lead a program made up of coaches, assistants, medical staff, S&C staff, administrative staff, academic support staff, logistics, equipment management, etc without having a leadership style that sets a clear vision and positively motivates people toward it. Look up the "Peter Principle" and you'll see why Pruitt was such an abject failure. It isn't because he doesn't know football or can't coach a group of guys. It is because he lacks leadership ability.
The last 2 failed miserably at the one skill that every leader must have to succeed. They were incapable of surrounding themselves with the right people. Dooley until Sunseri actually did a better job than those two of hiring assistants.
These are all flawed guys brought in to do a very difficult job... and failed. They're not "evil". They didn't take UT on purpose. Every one of them saw an opportunity soar in their careers by resurrecting one of CFB's great programs. Some of the reasons they failed were predictable.... Jones lack of actual football acumen for sure. Some weren't so easy to see.
We are where we are. Some don't like the turnover but the absolute worse thing you can do is keep a coach who isn't getting it done.
Can't win, right? Lincoln faced General RE Lee. The Civil War had to be won in Virginia to be won. Lee with an inferior force and supplies out-generaled the Union repeatedly. Much like Washington in the Revolution, many times "victory" was simply keeping his army together and in good order. He believed that he could win precisely like Washington did by stringing it out and at some point finding a decisive battle. He was brilliant. His soldiers were often more motivated. Stonewall Jackson was superior to any other General on either side prior to his untimely death and enabled Lee greater freedom to maneuver.
Lincoln hired, and fired, 5 very highly respected Generals to go against Lee in less than 4 years. McDowell, McClellan, Burnside, Hooker, and Meade. Finally he found a guy that was largely considered an unintelligent drunk. Unlike the others he wasn't all that interested in the press, politics, or image. He wasn't scared of Lee and seemed to be the first one to recognize that he had a vastly superior force. His one, overriding trait that made him successful was aggression. He wanted to be on the attack all the time. Far from being brilliant, he simply realized that if he marched on Richmond that Lee would have to put his army in front of his own... and the war would be over.
Point is that Lincoln hired and fired "good" guys before finding Grant who communicated a "vision" and then aligned his troops and officers to that vision. If he had stuck with McDowell or even McClellan... then there's a good chance the South would have won since they never seemed ready to attack.
I stated, "Finally Pruitt. Though I wanted to like him, a coach with terrible grammar, a N Alabama hillbilly, who could coach or so I thought. In the end, he was a disciplinarian at best and an abusive hick or worse, with no sense of being able to run a whole team in the end."
I stated that I wanted to like him. I too wanted him to be successful. I could not care less what a coach sounds like if he can lead UT. I thought he could coach. But, he just turned out to be abusive. Most of my family are country folk from Western Carolina. They might not have the best grammar but they are some of the best people on earth. I have no problem with accents or grammar, but when it comes to coaching, I want my coach to care for his team and be a man. A hick to me represents somebody, from the north, south, midwest, etc, oftentimes seemingly uneducated, but almost always by definition trashy and in this case abusive. You can be abusive and have great grammar, so my issue wasn't his grammar but his abusive, entitled behavior. He is a good coach in certain circumstances, maybe just as a D coordinator at the NFL or college level, but as of yet, not as a HC in college.