Because it can easily be directly reflected towards wins and losses.
One team had 'zero' criminal issues whatsoever but won a national championship, and this one is kicking suspect players off of the team no matter how vital they are and they missed a bowl game for the first time in 4 decades.
A lot can be attributed to the fan base and what they are willing to put up with too. Tennessee's fanbase had absolutely no problem whatsoever with Butch Jones having 46 cases of rape by his players during his tenure. NONE. Why? Because they were winning 10 games a season in back to back seasons. They didn't care how many coeds were raped as long as he was getting them towards winning the SEC East. Why did he ultimately get fired? Because he went 4-8 and didn't win a single SEC game in 2017. Not because he was harboring felons and rapists on his football roster. I am not making the same allegations against the FSU fanbase, I'm sure enough of them were fed up with the issues that their national championship team had off the field, I'm just saying some teams are willing to win no matter WHAT happens. Some are so desperate to win that that no rules that the NCAA or the laws of the USA have will stand in their way. See Georgia right now and Texas A&M. Georgia's fanbase would sacrifice kindergarteners on the 50 yard line every day at high noon from now until kickoff if it meant they could get to the 2019 national championship game and they wouldn't lose a second of sleep over it. Texas A&M is willing to throw millions if not billions of dollars towards winning The SEC and ultimately the national championship.