look I am not fearing the US government being able to track me down now that they have my SSN, thinking that they couldn't do it before.
My fear is Mexican Police having my SSN, and them selling my info to basically anyone from white trash in South Carolina to wannabe gangstas in Russia, who will then claim to be me and apply for a ton of credit cards, run up the balances, then laugh. My second fear is those same Mexican Police having my SSN will give this info to the guys who make fake I.D.s for mexicans wanting to work in the USA, because the best method employers now have is checking to see if the SSN provided by the prospect is a real one or a fake one. So now no more randomly made up numbers, they will all use real SSNs, just other people's SSNs. And now they have them in an easy to access list.