What benefits would the government (not the people) get from shutting down scammers? Scammers still pay taxes, and companies like Amazon that benefit from revenue obtained by scammers are major donors.
Uh, it's a representative democracy... The government isn't some nebulous mythical gorgon, it's supposedly responsive and representative of the people's needs.
Also I assure you, scammers aren't honestly filling out I-9s and W-4s adding up all the Western Union receipts. They're scamming the IRS as well