I think you need to learn a thing or two about what it means to be a "shareholder" and what the risks are.
The govt can guarantee the paper sold by Fannie and Freddie but that does not mean they are going to support the common stockholders.
There are similarities here to GM.
GM still exists but the previous holders of GM stock have nothing and will not participate in future earnings. MTLQQ remains but when GM returns to profitability and is sold off by the Govt holders of MTLQQ will not be given stock.