I'm surprised that a comment that started with "I'm no economist" and proceeds to claim a great many things without sources did so well on Hacker News. I wonder how well a comment like "I'm no computer scientist, but why can't we have consistency, availability AND partition tolerance" would have done.
Growth and employment comes with investment in increasing productivity, not from consumer spending.
I would read some books that take an opposite view to Keynes. Things will make more sense after absorbing the fact that consumption is not the source if economic growth, production and investment is.