That's because you (not really you, but your troll persona) are quite apparently dumb enough to think that anyone here means "we won't be able to print enough currency to cover these bills" when they say "we can't afford it."
Absolutely nobody is referring to the Federal Reserve's ability to create dollars. No one. Not one single person here. Because humans don't speak semantically in raw literal declaratives.
What they are saying is that the process of printing money (issuing new debt, creating it out of thin air, adding it to the ledger, however you insist on portraying it) to cover these expenses will, as it always has, destabilize the currency in a way that will at a minimum negatively impact the purchasing power of the population, or at the extremes, destabilize the entire society such that the status quo falls apart.
"We can't afford this" is no more a statement of monetary capacity than it is when a military/airline parent says "I can't afford to miss another soccer game or dance recital."
Normal people don't have to explain such simple context to the participants of a conversation, but apparently we would have to dumb it down for you keep up. Fortunately, your participation is neither necessary or beneficial to the conversation, so I doubt we will spend too much time trying. I'm taking a shit right now, so I have a little free time to indulge.