Economists fear deflation more than inflation because the inevitable result of that deflationary condition is a downward spiral in economic activity. There is less advantage in investing since future prices will be lower and there is an advantage to waiting since the cost of investment will decline in the future. There is an advantage in not buying things now because they will be cheaper in the future.(The apple buyers decide to wait a year since the ten dollars they save now will buy twice as many apples next year.)
Except that's BS. Double deflation yearly, how the hell exactly is that fantasy of yours supposed to happen? Economy will magically double over one year? A more realistic rate is something like 1-2%, and no, noone will skip buying an apple because oh wait, under 1% deflation, in, literally, actually, without exaggeration 70 years, that'll buy another apple. And deflation occurs during crises, but is an effect not cause. During crisis people don't stop buying apples because of deflation and hope for that second apple in 70 years, they stop buying apples because they see everything around them going to shambles, they're not sure if they'll be employed tomorrow, if their savings account actually even exists, if if they'll be able to sustain basic needs in close future if they spend on anything other than absolute bare necessities.
Two, if you really have some guy who'll hoard money in hope for that second apple in 70 years, well, guess that, he can already buy gold. Your 5% of inflation isn't forcing him to spend on apples today and build economy, it's forcing him to buy gold. And real estate too (btw, if you want to look for causes of real estate crisis, and tons of empty housing, thank those neokeynesian moron economists forcing people to buy real estate to escape their inflation, forcing real estate to turn from commodity to financial instrument. If money was deflationary by itself people wouldn't have to bother to use real estate as value storage).
Tons of financial instruments already exist that allow people to escape inflation, for people who know how to use them. Which yes, brings me to another point, inflation is really taxing the poor, the rich can trivially escape it, and you're not affecting THEIR spending in any way. It's the "upper poor, aspiring for middle class, saving money cent to cent to buy his own house or pay off his mortgage" type of person that gets buttraped by it most. I thought leftists wanted to be egalitarian and whatnot?