They can try making the case that the alternative to borrowing or taxing us an extra $2,000 each is a depression. It's almost certainly true that for most people, avoiding a depression is worth more than a $2,000 check. But they need to explain why dire consequences will occur if they don't get the money, not simply wave their hands and tell scare stories. Uncertainty in their explanation is fine. The situation is fluid and no one can be sure about many details. Obfuscation is not.
One might say that it's a very difficult bar I've set, and that Americans simply don't know enough economics to understand the explanation. In that case, I'd say then it's certainly past time educating the American people about economics. They can make that part of their explanation.
I say this as someone who suspects some action may end up being a good idea. But I still haven't heard a conclusive argument for action in general, and no convincing argument for this bailout in particular.
If you want our money, you have to convince us why we should give it to you. It's up to you to convince us.