Our population has doubled in the last 50 years and is growing at a very high rate --- and that's not saving social security. Ironically --- Mexico's social security system is even in bigger trouble, due to collapse sooner than ours --- so it makes no sense that adding millions of Mexican retirees to our system can save it. Especially when their criminal employers only hired them to avoid paying into social security as well as workman's comp.
The "Social Security is going broke" argument is the one we've been hearing lately from those who support open borders. In reality it's nothing but a ponzi scheme. You can keep bringing in people to prop it up but what do you do when they retire? Import millions more to support them? We might as well throw open our borders using that logic.