John Book- He knew what is morally right and wrong and although, could've joined the 'corrupt police force' he remained true to himself, and instead of adjusting he withdraws himself from the only group he belonged because in his heat of hearts he is blatantly aware that as a police officier he must protect and serve. In the end, by being 'true' to himself, he prevails and re-joins the police force, with a stronger sense of self. Hence, John sacrificed belonging for doing whats right, and as a result, things turned out well.
Although we can say John conformed to the Amish lifestyle he did not do so completely. His attire and sacrificing his gun can be seen as a form of conformation, but he still remains to do things by his book (get it cos' his John Book) and resolves conflict with violence. Therefore, John is true to himself, he leaves the Amish with a stronger identity (cos' he now realises he is so different) and possibly, will open up and start forming relationships.