Ah, very good points, I suppose I did leave some things out. Did you mean "everything Sukai DISlikes is in the military"? His only serious qualm is with death, and it was the PF's leanings toward non-lethal force that eased his conscience enough to allow him to join. I'm sure he would have some resentment in being in such a strict environment, but his way of dealing with problems is to confront and fix them, not avoid them; if he wants to promote peace but has to deal with unpleasant circumstances to do it, he'll try and make the circumstances better. He is an entertainer, after all.
You are right, it's an imperfect solution to his problems and doesn't match up with where I'm sure he'd like to be, but in my mind I think he saw the PF as simply the easiest way to attain peace in the galaxy. Although that opinion may change in the future if he sees evidence to the contrary.
Do you really think I should add a bit about his father's objections to the military? At the time that Sukai joined, he was living pretty far from his dad, only communicating long-distance. Then again, I suppose they were pretty close, so I should add that in...
Edit: Made changes to History.