Having the Right Reaction

Today in the documentary, there was a huge section on the Rebellion of Indians after the use of animal fat in their gun cartridges.  First, do you think that the use of the animal fat was the only thing that really drove away the Indians, or could there have been another overlooked problem.  Who do you think had the right to react the way they did, The Indians, or the British?  Third, is the reaction of either side necessary, what other ways could they have reacted?