Apparently even if acquitted completely in a civilian trial, he would not have been released, which makes the entire civilian trial just a pointless and stupid charade that will foreseeably result in our allegedly-best-ever justice system mocked around the world for becoming a mere tool of political theater.
Frankly after working in the U.S. justice system my whole life, I'm not so sure on that 'Best-ever' stuff; ours is roughly equal on balance to the justice systems of other Western democracies, leveling out all the pluses and minuses, and that's about as far as I'd really be willing to go with that.