Just like other professionals , trainers and barn owners don’t make emotional decisions. They make objective, money-based calculations. One of those is whether someone’s quirks are worth putting up with for the financial gain. And there are LOTS of difficult horse people.
As Bogey says, if someone had a vague memory of LK in a bad incident, they’d just take her on as a client and see if she paid off, literally.
There are probably people who would say they would never train with Barisone because all they know is “He’s the guy who shot someone.”