If some federal agent threatened to put my mother in jail, I'd probably say worse, whether she did anything or not.
All in all, he is not the most sympathetic of figures, but it doesn't mean the government gets a free pass.
If I say, "Jim is a dirtbag, I'm going to expose him and his whole dirty family," what have I done? It sounds like I'm just an investigative journalist with delusions of being good at my job and who probably has a personal grievance with Jim.
I happen to not be a fan of the individual in this case, but it's important to be realistic about the whole business of threats against reputation.