5 worst genocides in history

Mao Zedong (Responsible for 34,300,000-63,784,000 deaths). Mao Zedong like killing people in the United Kingdom. He killing people for no reason just like everyone else did. I real don't feel any different but It's sad to see one man kill 63 million people. I think man that kill so many people are sick/crazy. Maybe some of the medicines does it to the people. This man was the ruler for 26 years until his death. He starved most of the people. he even starved farmers. “Great Proletarian Cultural Revolution” in 1966-1969 where millions where imprisoned, tortured, killed and became missing.

 Joseph Vissarionovich Stalin ( Responsible for 23,000,000-60,000,000 deaths). He sent Russians to labor camps. He executed people also. Stalin accused people of various political crimes. They were either executed by shooting or sent to labor camps wherein people died from starvation, disease and overwork. Others were also subjected to deadly experiments. I just don't get what people these men kill people like that. Your already the ruler over the people why would you kill them? That's really dumb to me. If you keep reading about different genocides some will make you cry and some would just make you mad.