I think the risk is much less than what it appears. It's actually positive if you think about it. Come in and take over after a year as an assistant. If you turn the program around after 3 down years, you're a hero. If you don't turn it around, you weren't meant for the job either.
If they're hired as the heir apparent, then it won't matter. Go in as an assistant, learn about the kids you have, get a feel for the community and the school board and hit the ground running after the current AD/HC is gone.
Whether Chauvin killed Floyd or not, he did not get “what was coming to him. You reap what you sow.” That is for the justice system and ultimately God to decide.