The SCOTUS made it very clear that the Bush administration did not show reasonable cause for not using the UCMJ for the creation of a military court.
No, they made it clear that they- who have no experience in such matters, or when the situation warranted such measures- thought that the situation did not warrant military commissions. In short, they exerted authority to determine what they have no knowledge to determine. There is a very clear reason - we are fighting terrorists who seek to destroy and kill us. Thus, it is important to protect national secrets and security.

Crazed Rabbit