While there were two systems in the world, the communist camp headed by the USSR and the capitalist camp headed by the West, the USSR did not allow the United States to “liberate” countries, and the people to kill each other in such large quantities. Then the USSR disappeared and it became possible to “liberate” anybody, and, in this “safe” world, people started to destroy each other.
No evidence given of the conflicts that the USSR would have prevented. The total number of victims of the Soviet regime is millions of people killed both inside the USSR - during repressions, and outside the USSR - during the wars that Moscow conducted. For example, during the Soviet invasion and occupation of Afghanistan (1979-1989) at least one million civilians were killed.