"Socialists Claim Their System Is Morally Superior."
Their claim is not "wrong".
Rather, it's a deliberate lie designed to fool those who believe governments and polices should be "moral".
Lenin said that "morality" should be shunted aside so that any and all methods and tactics could be used to advance "socialism" (communism).
Hence the enormous death tolls stacked up by every communist government that has existed on Earth.