I'd say when you combine a few main elements, like the WTS does, you have a guaranty of uniformity. And that uniformity can be used in whichever way you want. Step 1: impose a common enemy, ie: Satan/demons. Step 2: Come up with an idea for the best possible reward that nearly every person would look forward to, allow it to be slightly personalized for each person, ie: The promise of living in a paradise, forever, with your friends, if your old, don't worry, you won't be any longer, if your pour, never fear, money will be a thing of the past, if youre young, well get ready to explore the whole world. Step 3: establish yourself as the only source for truth and the only way to salvation, ie. God is running this organization. Step 4: tell them all the same information and heavily regulate any other information contrary to what you are teaching, ie: bombard them with magazines, brochures, books and public discourses so they don't have time to read other information, then tell them any information that sheds bad light on the organization is from Satan. Step 5: add a large does of guilt, ie: "god is watching your every move." If you use these main elements properly, you will have a group of people willing to do anything for the purpose, if you want them to be peaceful and not rebelious, demand it, and you should get it.
I think it is interesting though to debate what level of peace they have. Sure they don't go to war or engage in riots or things as obviously violent, but just because they don't do these things doesn't mean they are living the best way of life. In fact, a willingness to fight when you feel it is for a good cause, can be one of the most peaceful things you can do. It saves others from having to suffer or being downtrodden.