They're raping nobody. The German Nazis are long gone. But there seems to be a notable lack of interest in actual Nazi politics in Estonia, leaving no other conclusion about why they'd do this than yes, it's to get in Russia's face.
You obviously missed the point. You would not rape your enemy's wife because that is an immoral act in itself, regardless of whose wife that woman is. The same is here: you approve of Estonians' salute to one of the two main horrors of the XX century. In that you too are raping the memory of the victims of fascism.
You should be ashamed of yourself. In fact, I do not even understand what you are doing on FreeRepublic: your values are completely incompatible with conservative ones.