Speaking specifically for America, the government can barely even agree on where it wants to spend its current "budget".
Say you have a couple who constantly fights over how to spend their $10m/yr budget, of which nearly half is borrowed, and 11% of which is spent on policing their entire neighborhood. Each year, they nearly default on their debt because they can't agree on a budget for the next year to keep paying interest.
You wouldn't give them even more money to solve their problems, because the problems are clearly with the amount and poor allocation of their spending. Why would you do the same with the US government?