War as a method to dispose excess wealth

We all live in a system that needs to grow to survive.
A big company motto is "go big or go home". Another similar motto is "Get big or die trying".
We all "need" the bigger, better, newer thing. We buy a new car, we buy a new computer, a new cellphone.
We buy new clothes and shoes, not because the old ones have holes in them but because "fashion" changes every season.
And all this is OK. We live within a consumer driven economy, so we play by its rules. We need to consume so that the economy grows and we can keep living in "our way of life".
But what happens when the economy cannot grow anymore, cannot find new markets or there just isn't enough money to go around?
What happens when everyone already has one, two or three cars, computers, cellphones?
What happens when for political or philosophical or moral or whatever reasons we as a society decide to consume less?
Disaster! Growth stops. Company earnings diminish. Stock value falls. The economy "cools down". Companies bankrupt. Factories close down, people get fired. The number of unemployed grows.
Now, less people can afford to buy and sustain the economy. More companies, smaller ones, close. We enter a financial crisis.

Do you know what we do if we have a production of a bunch of stuff that nobody wants?
Do we give it up for free? no, because this would drive the prices down.
Do we store the stuff in a box and get it out whenever someone will want it? no, because of the cost of storing and because when people will need it, it may be spoiled, broken or outdated.
What we do with such stuff is DESTROY IT. If it is perishable, we bury it, if not we burn it. If we can "recycle" it then we scrap it.

And now, after reading all this... maybe you have an idea of how to destroy huge quantities of stuff... burn whole cities of stuff, demolish whole infrastructure (e.g. roads, bridges, airports, factories etc) of a country, so we can build it again. Not yet?

OK... another idea. What if we create a whole new category of stuff and label it "this is stuff to destroy". Build factories to make stuff for it to be destroyed, make big companies that sell this stuff. Make this stuff REALLY EXPENSIVE, so that this kind of companies keep growing.
And make this stuff easy to destroy. Build huge piles of this stuff and then press a button and BANG! it is gone!

Well, this industry exists. It is called DEFENSE industry. And the self-destructing stuff is called WEAPONS. And the method of destroying cities and infrastructure is called WAR.

So, as you see, we are already using all this, as a method to keep the economy growing without ever stopping.