The trick here is there's nothing to "take away". These benefits exist only as promises - there's no funding for them. If I promise to you if you work for me for a decade I will give you a trillion dollars, and then turns out I don't actually have the trillion dollars, the theft - or, more precisely, the fraud - doesn't happen when the lack of the trillion dollars is revealed. It happened when I promised you the trillion dollars without having it. The theft from these people has already happened - that's what people fail to realize.