It's not a matter of popularity contest, it's a matter of peer review. There's a difference between invoking academic consensus and what a few bozos off of /r/anarcho_capitalism think about the economy.
I don't necessarily believe that inflation is what causes investment; the profit motive does that. What I believe is that deflation not caused by a positive supply shock is typically going to be harmful for an economy. The Volker disinflation was absolutely necessary, and stagflation was emphatically not caused by speculation. This is just silly, dude.
I think it's your turn to answer my questions now--here are three for you to work with for your next response, so you don't have to dig.
1) Why are most recessions deflationary? If caused by capital misallocation (which, to me, sounds like "negative supply shock"), why don't we see price increases in every recession?
2) Why is AD simplistic for modeling recessions? You don't think the entirety of the NK perspective is one big AS-AD model, do you?
3) Do you seriously not think stagflation was caused by the massive negative oil shock we experienced in the 70's?