Inflation doesn't decrease profits or wages if done properly, and this has been quite well documented and researched. Mild inflation boosts consumer confidence because we've seen it directly lead to more spending, which props up businesses that wouldn't otherwise exist without those spenders while simultaneously creating new businesses. And since spending by itself accounts for near 70% of economic output yearly, it's impact is huge. Mild inflation also gives the (sometimes illusionary) annual increase in wages which (again if done properly) leads to real increases in wages and standards of living.
It can't be a tax if it doesn't actually hurt you, but besides, it's not like inflation is avoidable; it happened without the Fed for decades, in fact it was mostly in the form of the far worse alternative scenario of deflation and generally destroyed any prospect of equities growth.
I said past profits/labor. If, as a product of my labor, I make $100 today and stick it under my mattress in 10 years inflation will have reduced the value or purchasing power of that $100. Therefor my past labor or profit is now worth less in terms of purchasing power. It is the very definition of inflation.
In our current climate any sort of substantial inflation (4% or so) will be the death nail of the housing market, jack up interest rates and kill the Federal budget and sorry to tell ya bud, wages ain't going up anytime soon.
We still have that entire $5 a day and illegal immigrant problem to deal with before we can ever see wages really rise (especially above 4% a year).
I am frankly amazed that so many people I would consider left leaning are for policies that by design make the poor/middle class poorer. The entire "spend spend spend on bullshit that you don't need" economic system was a debt fueled bubble that creates a ton of jobs somewhere else and a few jobs at best buy here.
Edit: And yes, inflation IS avoidable. Certain people like inflation and thats why we have "targets" that tend to exclude a lot of things that we kinda need (like housing).