Your representation is largely correct. It just is irrelevant. The trust fund - which is included in headline figures of national debt - doesn't count as debt. It's money the government has decided it owes itself.
Yes, the current way to make up for the SS deficit from payroll taxes is to fund it from general revenue - in this case, deficit spending. That's the same as any other government expenditure. But with other government expenditures we didn't make up an imaginary pile of money and say it was saved for, say, defense procurements. The $5 trillion is not real debt. It roughly represents $5 trillion of general spending over the last several decades (spent on, say, infrastructure, or defense, or whatever) that was surplus to SS/Medicare/etc. needs at the time. That's all. We don't owe $5 trillion to anyone.
Now, we do have a current legal commitment to provide SS benefits to citizens on the basis of enacted law. This is an issue going forward as the program moves permanently into deficit, but it has no bearing on the nature of $5 trillion of intragovernmental debt. It calls for policy action, no question, due to the dire fiscal consequences of ignoring said action. But it doesn't translate into money the government actually has to pay anyone.
edit: Here's a brief explanation that largely matches my thinking: http://www.cbpp.org/cms/index.cfm?fa=view&id=3197


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