Things have value, and demanding that others give you things of value simply because they are part of society is a violation of their rights.

Combine this with the communists' theory of labour, and you can prove that communism is just a rewording of the re-institution of slavery, after all, you don't deserve what you produce, we do.

These people are slavery advocates, just so long as they are the beneficiaries. Why don't they understand that communism doesn't work?

Because they don't work either.