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Saying "Communism is evil" is no different than saying "Capitalism is evil" with nothing to back it up. Contrary to maybe-current opinion, Communism and Democracy are not diametrically opposed: the former is an economic policy, the latter a system of government. You can have both, one or the other, or neither all at once.
Sure, maybe the governments that tried to implement communism failed on the world stage. Some today would say the same thing about the current economic/governmental systems-that-be (the US government of pre-WWII + cold war era was much more socialistic and less democratic than it is today – up to a 90% marginal income tax and no democratic election of US senators, very different than it is today!).
This entire article is about how, at least anecdotally, someone who lived under such a regime doesn't remember it being evil – in fact, quite the opposite! Governments, economic systems, and powers-that-be are always changing. In 20 years do we really think everything will be the same as it is now?