In order to insulate the courts from POPULAR PASSIONS, the founders ensure that federal judges are APPOINTED FOR LIFE. The principal objective of the life tenure given to federal judges is to insulate them external pressures. The life term provides job security for them and enable them to do what is right under the law, since they do not have to fear that their position will be terminated if they make unpopular decisions.
The britons had already gone into the iron era which rome was just introduced to. a disadvantage was strategy. the romans were strategically gods.in other words the britons were not great strategists.