If the economic modelling you use does not have a recession as one of it's possible states. It is not a model of the economy.
If your model of how individual agents interact is not consistent with the rules of double entry book-keeping, you do not have a model of the economy.
If your model of a firms profits don't line up with empirical evidence... you get the idea.
When you impose that model on an actual economy, and it fails to follow your expectations. It isn't the real world that is at fault.
Paraphrasing Hyman Minsky; The natural instability of capitalism is upwards. When firms take small risks and they pay off, they learn to take bigger and bigger risks. Bankers have an incentive to fund larger and larger risks. Asset prices climb. It becomes profitable to speculate on assets without having the income to cover your interest payments. Until the debt level peaks and the whole process works in reverse. A boom becomes a slump. There's a period of pain, when bankers and firms reduce their willingness to take risks. The economy recovers, firms take small risks and they pay off....
But everyone starts the next cycle, still carrying some of their debts from the previous cycle. If there's high inflation, who cares. You can easily pay off your debts with your increased income. But when the mountain of debt in the system gets too large, inflation is impossible.
Once inflation turns to de-flation, the cycle is broken. What starts as a period of tranquility. A "Great Moderation" if you will. Suddenly turns into a crisis. Debtors go bankrupt, money is destroyed. Distressed sellers discover the market is much smaller than they thought it was. Even low risk projects fail as the economy suddenly shrinks.
But if the government sector taxes more in the good times, and runs a deficit during a slump. They can dampen the cycle. They can lessen the pain of the inevitable crash. But do you really think that the people will allow high taxation during a long period with very little trouble?
Do you really think the government caused this? A government run by economists who haven't learnt the right lessons from history. Economists who misunderstand and ignore the role of money and credit. Economists who codified their model of a perfect economy into law. A model which has nothing to do with how the real economy actually works.