ELI5: Why is Deflation bad?

I get that too much deflation is bad, but isn't the inverse true?

The average inflation rate in the US since 1914 is 3.3%, meaning the 1913 dollar is worth $31.87 now.

Why wouldn't we want deflation? Then maybe the $7.25 minimum wage COULD be a livable wage?

Why do people constantly argue for MORE money, versus less currency in the market?