The primary purpose of money is a store of value, so that it can proxy for products and services in commerce. It must retain value over time to properly function. If it doesn't then the whole economy is badly distorted, made inefficient.
It is all a matter of degree. If you spend most of your income within a month, and invest the remainder, you will hardly notice an inflation of 5%/year.
Yes, Brazil too had a bank account freeze, around 1990. That hurt a lot. But it was not so much a consequence of inflation, rather a very stupid attempt to curb it.
Many people were hurt badly when the current unit (the Real) was devalued 50%, immediately after the president was re-elected. The Real was guaranteed to be "inflation-free", pegged to the dollar, and therefore bank savings were no longer corrected for inflation.
Hoarding is simply the same as saving. Savings are what makes capitalism a viable economic model. Inflation is a stealth tax from those who have last use of new money (the poor, middle class) to the pockets of those who have first use of new money (the banks, wealthy, government).
Hoarding currency is a very stupid way of saving.
Saving is a tax on workers: you work now, but instead of buying a car right away with your salary, you buy it only months or years later; in the meantime someone else uses that car. That may benefit capitalists, but what drives capitalism is productive investment in factories etc., and what makes the capitalist economy spin is spending, not saving.
Inflation is a diffuse tax, whereby government takes from society an amount equal to the amount of currency that exists times the inflation rate. Each person pays that tax proportionally to the amount of currency that he has and how long he keeps it before spending it.
Like any tax, inflation tax not inherently evil: a good government should give it back to society as public services and infrastructure. A bad government may waste it (for example by rescuing failed banks), or use it for evil ends, but that is a separate problem. But it is debatable whether inflation tax, as way to support the government, is more fair and effective than revenue tax, consumption tax, etc.. Experience seems to say it isn't: countries that abuse it generally have lousy economies. Anyway, it is not a simple, black on white issue.