At the end of the day from seeing his interview it really came off to me that Hunter defrauded him and the company they created. Thats what I took from it. Hunter took money from the ching chongs and didn't tell Tony how much. He got wind of congress's report and saw the fazools that Hunter was raking in and it pissed him off.

Consider that the Big Guy was ear marked for 10% and sharing an office with Hunter that would make Joe an accessory to fraud. But you know the FBI and all that jazz.