That isn't retirement money, it's a Ponzi scheme. Your money is gone the second the government snatches it away from you. You're right in a way though, they have stolen your retirement money, but they stole it through the SS system. Had you been able to keep that money all these years, you would have been able to invest it on your own for retirement.
One other thought, I wonder how many leftist boomers who pushed for abortion, and continue to this day, now fret over there not being enough younger Americans to pay for their retirement.