Overspending.

If you and your family overspend - you end up in debt and owing interest.
If you continue this approach to life - you get into ever deeper trouble.
Why is it that so many leftists who run their family budgets really efficiently cannot extrapolate from this scenario and see that governments must work to almost identical principles?

There really is NO fairy godmother. (Translation: means of extracting money from others to make your crazy scheme work!)