Most of the deaths associated with "communism" in Russia and China were due to how unimaginably poor and undeveloped the countries were before their revolutions, Russia and China were essentially medieval with very little industry, they also suffered cyclical famines during monarchical/feudal times with many perishing, so it's rather strange to pin the blame on the communists for the countries they inherited. If anything the industrialization during the Five-Year Plans turned Russia from a rural backwater into an industrial superpower within 10 years, while industrialization in England/America/France took place over a hundred years or more. And after those 10 years Hitler invaded the Soviet Union (just as Stalin said that "Either we make up this lag in 10 years, either we do it or they crush us"), so you can hardly say the extreme pace of the development wasn't needed, considering that the USSR was encircled by capitalist powers who wanted to destroy them (militarist Japan in the East, Nazi Germany/Fascist Italy and other states in the West).