Inflation is evil because it takes purchasing power away from currency holders (and, in general, the poorer you are, the higher the percentage of your savings is based on currency), and gives it to the firsts to receive the newly printed money, namely governments, banks and those well connected to them. But even worse than that, inflation is evil because it creates capital destructive business cycles. All this crisis the world is living now would not have happened if central banks did not have the power to inflate their currencies in order to manipulate interest rates.

Oh, and BTW, the 2% rate you talk about, it's the official estimation on price inflation. The actual monetary inflation is much higher. What means that, if money supply was stable, average prices would decrease. It's not just 2% of purchasing power you lose per year, it's much more, since you'd have to consider how lower would prices be if there was no inflation.