Why does communism / socialism attract individual in a torn society? what is one part in history that shows this?

The way communism or socialism can attract people is by having a equal society. Also both of these ideologies promote free health care, free college, and equal wages. However as you have seen in the past socialism and communism do not work. Free healthcare and college cause large amounts of debt and equal wages means a doctor who went to college for 8 years makes as much money as a McDonald's worker. But even through this people still follow the ideology. Examples of this are the Russian Revolution and the Communist Chinese takeover. And even today in America we have communists.