> The big example of the US in the 1930s led to an economy that conquered most of the known world in short order

...by confiscating the gold, devaluing the USD from $20/oz to $35/oz, and taking on a lot of debt. Hoover's policy and FDR's policy lie in stark contrast. As do their results. This example points in the opposite direction that you think it does.

Germany is another common go-to example, the Weimar inflation of the early 20s proceeded under almost full employment and settled down once the root causes were addressed with people a little worse for the wear. The deflationary shock of the late 20s, on the other hand, propelled the Nazis into power, and the secret debt that they used to rev the economy was structured in a way that could only be repaid with a war of conquest, which they started, killed a lot of people, and lost.

The root problem is too much debt. Inflation and deflation are just how to deal with it. They both suck, but an inflating economy has jobs while a deflating economy doesn't. In both cases, many innocents will be unfairly liquidated, but in the inflating economy you can get a job, scramble, and make do, while in a deflating economy there are no jobs, so you watch your bank account count down to 0. Of course, the people who get there first don't curl up and die in a corner, they choose to fight like cornered animals and things get nasty.

> ...by confiscating the gold, devaluing the USD from $20/oz to $35/oz, and taking on a lot of debt.

These things are only useful if interacting with a strong industrial economy. If the economy is in a bad place then it won't help - there are a lot of countries that have confiscated, devalued, taken on lots of debt then sunk because their economy isn't any good. Pretty much any country that runs in to economic trouble tries some combination of them at some point.

What actually matters is formation of new businesses and capital. Monetary inflation doesn't help with that in any meaningful way; it's basically just another tax because it reallocates resources from the productive economy to whoever is getting first dibs on the free money.

> The deflationary shock of the late 20s, on the other hand, propelled the Nazis into power...

Yeah, that's unconvincing. It's well established that the people with power in the German economy couldn't bring about general prosperity (arguably because they'd lost a war, arguably because they just weren't very competent). They let a hyperinflation happen, that's quite compelling to show they failed to inspire any confidence. Decades of pain and mismanagement and then the clear lesson we can learn from all that is if they'd printed even more money they'd get a good result? The evidence is too thin to support the conclusion, and contrary to the fact that they tried exactly that tactic with terrible results.

> The root problem is too much debt. Inflation and deflation are just how to deal with it. They both suck, but an inflating economy has jobs while a deflating economy doesn't.

So don't do either? Just forgive the debts directly.

Inflation and deflation don't theoretically have any effect on debt, the people lending the money can charge a real interest rate and account for inflation. Unless the government intervenes which makes the argument for the indirect inflation solution a bit moot because the regulators directly controlling the debts anyway. And if it's supposed to be an overly complex debt forgiveness scheme it doesn't work. The US has the largest debts in history under an inflationary monetary scheme.