If these guys are convicted by some Kangaroo Court, then the FBI should go full steam ahead with a Civil Rights Violation against them, while, at the same time, the convictions should be overturned in a higher court.
There won't be any violence against Liefong. The kind of people who want to see these boys swing are the kinds who would do violence. The ones who see this for what this is are law-abiding, upstanding Americans who don't take the law into their own hands and attack public officials with violence.
The "average citizen" you mentioned has too much to lose by bringing physical violence to the scene. And, because of Steve Monks and what's-his-name Cheeks, the "average citizen" lost out to the animals who want this to proceed to a lynching of whitey out of a misbegotten need for revenge.