I don't suppose you know how we got out of the great depression?

Through massive, absolutely massive, government spending.

Imagine you're running a household and your main breadwinner needs surgery to continue working. Surgery's expensive, so would you say you won't buy it? Of course not, you will pay for the surgery and the rest of the household will start contributing to everyday expenses as well. You don't stop spending money, you continue to spend to meet your needs. If Mary needs to buy a car so she can drive to work, she should, get that car. Because a stable income is more important than temporary debt, as you can pay off that car in the long run. But if you don't buy the car or surgery, you're simply stuck as bills continue to pile up.

Government spending works similarly, you might think things like infrastructure are frivolous but it has been proven time and again that government spending improves the economy. Because an economy works best when there is a large flow of money, and stagnates when everyone starts saving money. While that doesn't mean you should never save, it does mean (contrary to popular belief) that spending money actually improves the economy. A faster flow of money means more jobs, more income, more business.