If they plead guilty, and this's accepted, then they face the death sentence, so obviously if this happened, they'd be seen as martyrs in the eyes of their followers. However, Mr. Mohammed later retracted this, and said he wants all the men to stand together and be judged - probably hoping that a verdict won't be reached, and they'll just receive a life behind bars sentence. Whatever happens, they'll be seen as martyrs by other terrorists. Just pleading guilty'd make them look that way. It'd be best if no media coverage was given to these men, but it won't happen.