So after two world wars we had higher debt? That's not particularly reassuring. Most people would accept that debt to finance fighting an existential threat to the nation is regrettable, but understandable.
This idea that government spending during peacetime, can and should be financed by debt is why we're in the situation we're in today. Big mistake giving politicians a blank cheque.
I don't agree that our debt levels are no big deal, in fact they are unsustainable, we are reaching the point where we are running out of buyers for our debt, which sends the rate higher, costing the government even more to service.
This is what's known as a debt doom loop, as the government borrows more, the bond markets require higher rates, which costs the government more, which means the government borrows more, etc, etc.
We've already reached the stage where servicing debt is a significant portion of government spending and this gets worse until we address this issue by cutting spending. If we don't do this voluntarily we're looking at a debt crisis eventually and then we're in for a world of pain.