Why would the British Parliament say taxation was justified?

They would say that the British troops fought for the colonists to defend the colonies, so the higher taxes is justified to pay for the troops, supplies, etc. The colonists countered back that they did not have proper representation to have a say on how the taxes should be raised and on what product, which is what led to the Revolutionary War.

- "the die is cast; i have consented to return if we are not destroyed. thus are my hopes blasted by cowardice and indecision; i come back ignorant and disappointed. it requires more philosophy than i possess to bear this injustice with patience. i have lost my hopes of utility and glory; i have lost my friend."

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