The case was sealed.... Heck even the DA himself wasn't aware of it... Its not FNC's fault... How would they have known until it became public?
Their foolishness in hiring him came long before any of this. If folks on FR could see (long ago) that Ritter was imbalanced, why couldn't Fox?
BTW, you don't have to answer that. I know it's important for them to have 'contrarians' in their tool shed. I would just suggest that they screen their tools a bit more closely.