The one minute fairness case for a basic income guarantee:
Property is a social construct legally enforced by the government. If all people are considered equal, then absent any other considerations, each person should have an equal amount of property. So material equality should be the default. In a free market economy with a basic income at or below the highest sustainable rate, those who choose to live off of the basic income are not living off of the work of others. Rather, they are living off of less than their "fair share" of property and allowing the extra to be used by those who choose to work.