The prosecution of this particular individual doesn’t pose any problems at all. He was, after all, caught red handed with numerous witnesses.
Now, the interrogation of Hasan and investigating who his confederates were should be kept on the q.t. until the co-conspirators can be rounded up.
Military law which is explicit regarding the negative impact of real or perceived command influence. There is a whole host of anti-American lawyers planning strategies to derail a trial. These pricks do not need any help from us.