Numerous books, in India & abroad have tried to explain the causes of the revolt of 1857. Have a look what appeared in an American Magazine:
"..That rebellion took the world by surprise, and nowhere more so, it would seem, than in England. A remarkable proof of this is to be found in the tone and language of the debate that took place in the British House of Commons on the 27th of July, in which Mr. Disraeli, Lord Pahuerston, Lord John Russell, Mr. Whiteside, Mr. T. Baring, Sir T. E. Perry, Mr. Mangles, Mr. Vernon Smith, and others, participated. That debate was most lively and interesting; and the reading of the ample report in the Times revives the recollection of the great field-days of the English senate. ....
Yet the conclusion to which the careful reader of the report must come is, that neither Mr. Disraeli, nor the Premier, nor the President of the Board of Control, nor the Chairman of the Directors of the East India Company, nor any other of the speakers, had a definite idea of the cause of the sudden mutiny of the Sepoys. It is impossible not to admire Mr. Disraeli's talents, as displayed in this speech; and equally impossible is it to find in that speech anything that an intelligent observer of Indian affairs can regard as settling the question, Why did the Sepoys of the Bengal army mutiny in 1857? Everything that he brought forward as a cause of the mutiny was distinctly proved not to be worthy of the name of a cause. Yet the men who could show that he had failed to clear up the mystery could themselves throw no light upon it. The government was especially ignorant of all that it should have known; and there is something almost ludicrous in the tone of the speech made by the President of the Board of Control..."
(Source: The Atlantic monthly. November 1857)