According to the Declaration, ways in which the King denied the colonists "life, liberty and the pursuit of happiness" is that he did not allow them to make their own laws, he did not allow the colonists to trade with other parts of the world and he kept standing armies amongst them in times of peace without their consent.
Sample response: By blocking their ability to pass laws, the king limited the colonists' liberty. By punishing and killing those who disagreed with him, he violated their unalienable rights.
Because the Germans had killed off a lot of innocent Soviets which the Soviets wanted the Nazi people to pay for by executing or torturing the Nazis before execution. But the British and U.S. forces would not execute as many because the Germans did not execute them