You are only looking at who is hurt by deflation not the benefits. This is why Central Banking is so dangerous. It picks winners and losers for every action it takes.
Deflation hurts those:
in debt just like inflation hurts savers.
with houses but helps those looking to buy a house.
An economy needs savings to grow. Going into debt when there isn't actual savings (producing more than is consumed) cannot lead to sustainable growth but only malinvestment bubbles and crashes.
There is no such thing as a deflationary spiral. The economy always adjusts to whatever the money supply is. It just depends which industries were overvalued. Japan is suffering from stagflation where the Central Bank refuses to let deflation happen.
I agree that few economists think deflation is desirable which is why we are in such a mess right now.