deflation is a tax on borrowing which discourages growth, causing more deflation ad nauseam.
Inflation is a tax on saving which encourages malinvestment "bubbles" that fail catastrophically.
Monetary policy addresses them by creating ever more money to encourage ever more synthetic growth. Once debt service threatens to consume the sovereign budget, monetary tightening ceases to be politically viable.
Not for nothing, we appear to be living in the Keynesian "long run."
“Hey Joe, I know you like that $1000 machine, but are you willing to buy a better one for $500?”
“Gee, no thanks!”