You started off with sense. Then went down the crazy lane.
Let's start with the People's Republic of China. Its creation directly and indirectly killed maybe 10 million. But still, it wasn't technically China until they had defeated the nationalists.
- Mao's original counterrevolutionary campaign. At least 712,000 people were executed, 1,290,000 were imprisoned in labor camps and 1,200,000 were arrest, harassment, etc.
- Great Leap Forward, up to 45 million killed. Maybe up to 2.5 executed or tortured to death.
- Great Proletarian Cultural Revolution, about a million, give or take several hundred thousand.
Stalin?
Red Revolution was in the hundreds of thousands. Decossackization was about 300,000. Yezhovshchina had 1,710,000 people were arrested and 724,000 people executed, with 100,000 priests, monks and nuns specifically targeted for execution. NKVD did counterrevolutionary cleansing in the 1930's with 350,000 were arrested and 247,157 were executed. Mongolian Terror was only 20,000-30,000 but largely focused on Buddhist priests. Holodomor killed maybe 4 million via systematic starvation. Mass deportations often had very high death rates, the Crimean Tatars had roughly a third death rate.
And the Red Army generally acted like savages.
http://en.wikipedia.org/wiki/Soviet_war_crimes
Not saying America is a picnic, but you sir are WAY off base. Sure, our incarceration rate is through the roof. But we're not starving our prisoners in Alaska, launching numerous massive rape and loot campaigns or forcing entire states to resort to cannibalism from enforced starvation. We wiped out a very large percent of the Native Americans, but mostly through disease. The worst massecre was Trail of Tears, which killed 60,000 of the 130,000 Cherokee, intermarried and accompanying European-Americans, and African-American free blacks and slaves owned by the Cherokee (yes, Native Americans owned slaves). It was not exactly a one way war. Settlers were massacred by Native Americans as well as Native Americans by settlers.