>"Didn't happen... for <insert reasons that are now thought to be obvious but nobody knew before hand>."
That's not exactly true, MMT was right about that beforehand, this is from 2009:
"There are also those that claim that quantitative easing will expose the economy to uncontrollable inflation. This is just harking back to the old and flawed Monetarist doctrine based on the so-called Quantity Theory of Money. "
I think you feel that way because you can't appreciate the argument from only a small quote. They get it right.
The reason QE was (is) not inflationary is because that money it's not being spent in the economy, it's only adding bank reserves. Bank reserves make the interest rate go lower, but, it will not go lower than zero, after that you can create all the reserves you want.
Lower interest rates make credit more cheaper, but cheaper credit doesn't influence the economy if nobody is borrowing.
Also, bank lending is not constrained by reserves. Lowering the interest rate will make borrowing more attractive for borrowers, but that doesn't make easier for banks to lend, because they are not constrained by reserves. They are constrained by the number of borrowers to whom makes business sense to lend.
So, the quantity theory of money is wrong and the fractional reserves model is a fallacy. That should be obvious by now. The Modern Monetary Theory guys were saying that, way before 2008.
That's not exactly true, MMT was right about that beforehand, this is from 2009:
"There are also those that claim that quantitative easing will expose the economy to uncontrollable inflation. This is just harking back to the old and flawed Monetarist doctrine based on the so-called Quantity Theory of Money. "
From: http://bilbo.economicoutlook.net/blog/?p=661