I get that background checks do not catch everything, but when I have done background checks on my hires, the types of thing that Joseph did in college would have shown up. If that was known by the athletic department, there is no reason he should have been put in such a visible role as interim HC, just as many companies would not allow someone with a similar background obtain a senior position in that company. When you get to these types of visible positions, the focus needs to be on brand and reputation management and ensuring the right person is in place to lead all aspects of a program, especially young men who are still being molded.
And with Frost, there had to be questions of his behavior of missing recruiting trips and likely coming to practice where others knew he had been drinking too much.
With that said, it appears Rhule is pretty squeaky clean which is a great thing for the program at this time.