I don't hate him, but I do dislike how he seems heartless. But we must remember we only see him from Deryn and Alek's perspective. What would he be like from, say, his lover?
And yes, he would try and sneak in, but the Mil's would catch him and mess with him. Actually, that's better; Tally screws up trying to sabotage something, gets captured, David and co go after her and get captured themselves.
Simply put; the Specials would prove to be worthless as I've always believed them to be.