Whilst by no means foolproof and each implementation being different, for people to make a sweeping statement that its unsecure and worthless just shows ignorance of the technology.
I understand the technology well enough to make the statement.....in relation to people and RFID. The chips work great for products in the supply chain, but people aren't products, are they? I don't believe I said the RFID systems were worthless, just completely insecure.
Would you mail to me your bank and credit card information.....if it were protected by the most effective encryption scheme currently known? Strong as it is....would you still trust it in my hands? It's nice that technology advances, but possibility does not necessarily imply necessity. Who benefits? RFID manufacturers and the government, in the form of yet another layer of unwelcome control.