Er, no. 25 years ago we had Wall Street championing computer backed loan securitization, and repackaging of the those instruments into CDO's etc. That led over time to the subprime loans - as by creating the means of providing more debt instruments, Wall Street them had to find more borrowers. Which didn't end well - it never does. QE was done to stop the financial system imploding when those loans defaulted.

To explain the deflation story especially over the last 4 or 5 years, you need to look at the drop in Oil Prices - which as you point out, is primarily due to fracking and the US going from the #1 oil importer in the world to a small exporter. I wouldn't call the export aspect major statistically, but the change in oil trade terms certainly is.