Because this is what communism brought us in the 20th centruy.
The worst genocides of the 20th Century
Mao Ze-Dong (China, 1958-61 and 1966-69, Tibet 1949-50) 49-78,000,000
Jozef Stalin (USSR, 1932-39) 23,000,000 (the purges plus Ukraine's famine)
Adolf Hitler (Germany, 1939-1945) 12,000,000 (concentration camps and civilians WWII)
Hideki Tojo (Japan, 1941-44) 5,000,000 (civilians in WWII)
Ismail Enver (Turkey, 1915-20) 1,200,000 Armenians (1915) + 350,000 Greek Pontians and 480,000 Anatolian Greeks (1916-22) + 500,000 Assyrians (1915-20)
Pol Pot (Cambodia, 1975-79) 1,700,000
Kim Il Sung (North Korea, 1948-94) 1.6 million (purges and concentration camps)
Menghistu (Ethiopia, 1975-78) 1,500,000
Yakubu Gowon (Biafra, 1967-1970) 1,000,000
Leonid Brezhnev (Afghanistan, 1979-1982) 900,000
As this communist once said:
"The goal of socialism is communism."
Vladimir Lenin
As this wise man that saved democracy in the 20th century said:
"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery."
Winston Churchill
And that dear DUchebag is why at it's heart socialism is evil.