Agree. I've never heard that the commandments were given in order of importance but it makes sense. The first 3 commandments are directed towards God and spiritual things. The last 7 towards your neighbor and temporal things. Since the 4th commandment concerns itself with obedience to temporal authority (i.e. parents, country, Church), then it stands to reason that this is of the highest importance to the operation of society. If you don't have order, authority and hierarchy, you have chaos. Killing someone is temporary choas, which only affects society in the short-term, while disobedience and mutiny leads to rioting, revolts and civil unrest - a long-term destruction.