If I may be so bold as to inject an admittedly amateur historian's perspective, while I agree that it's important to not make light of the terrors of the past, it's also important to learn from them. While Russia isn't as bad as Nazi Germany, it's not like they started exterminating Jews, Roma, Gays, etc. immediately. They built up to it with propaganda and censorship, continually demonizing the "enemy" until there was little objection. With such a power-hungry leader as Putin, I would not be at all surprised to see a similar process in Russia today. As the old cliché goes, "those who do not learn for history are doomed to repeat it". We cannot simply look on history as vague myths and static events, but as an actual part of our world, and a source of valuable learning and lessons. This looks all to like late 30s Germany, with a formerly powerful nation seeking to regain its lost glory, a charismatic leader with dreams of grandeur, and an eagerness to hate anyone who threatens the "glorious nation". And that's why I have no problem comparing Putin and his supporters to Nazis, because it is important to recognize these thing Before they start killing.