Deflation is bad. Then people stop spending, postpone all purchases, economy grinds to a halt, people lose jobs and companies go bankrupt.
Hyperinflation is bad. Then people spend money like toilet paper: money becomes worthless. No one has anything left to invest or to save for pension or a big plan or dream.
The general goal of aiming for about 2% inflation is basically just there to try to prevent those two worst case scenarios from happening. It’s the least bad of all evils: money sort of keeps it’s value, evolution of product prices are rather predictable, people know what they will be able to buy with their wages. Inflation is not inherently tied to capitalism only. Socialist/communist economic experiments experience very similar phenomena.
Maybe the best solution is to build a Truman show like simulated world and contain the Trump problem in there.