"rule of thumb," or simple habit and common sense, and instead use the scientific method to study work and determine the most efficient way to perform specific tasks.
What President Roosevelt did which has never been done before in conservation was that the president made conservation a major part of his administration. He was a dynamic force in the new movement which was known as conservationism. The president saw the need to preserve natural resources and he put in place appropriate mechanisms to do this. At the end of his tenure, he had already built five national parks, four game refugees, fifty one national bird reservations and national forest service.
One reason is his attempted assassination on march 30,1981
Colonial subjects who choose to cooperate are often given a reward or status not otherwise given under the old rule. This was a common tactic of the British--pull underclasses into the military and/or government rule. By doing this, you get support, it is cost effective as the colony will govern itself, and you lessen the power of the old elite.
The old elite are more likely to react with violence or rejection of the colonial system. They are typically more equipped to fight against the colonial power. Additionally, members of the military, if replaced, may also rebel against the colonial power. Another factor contributing to rebellion, may be the removal of important traditions or religious rites.