It's illegal and it's not as innocent as you make it sound when it is intertwined with other illegal activities such as extortion, loansharking, assault, blackmail, conspiracy, tax evasion and murder.

They are either in the mafia or pay off the mafia.

Why should other people work hard, pay taxes and contribute to society in this case?

I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.