I disagree. Some are born there and are living there to no fault of their own. I do agree they should get the hell out of there, however. But to say that they are all traitors is a bit much. If all it takes is to live in a certain place and that equates to giving "support" or credibility of some kind to the evil powers residing there and/or that used to reside there, then There is no place on earth where one can live and not be in support of evil. Israel included.
I agree with Chaim to a large extent.
You are right to point out that no Galut Jew is guilty of having been born in the Exile. They couldn't help it and it is not a crime. However, once they have grown up and they are in a position to make aliyah, then they make a choice by staying in the Exile. Especially today, when Israel is a modern country with economic opportunities and various programmes to facilitate aliyah. It is a fact that the Torah commands Galut Jews to gather in Israel. So staying in the Exile under these circumstances is a violation of the Torah. There is only a couple of restrictive exceptions that the Sages have laid out, such as when leaving the Exile may endanger the lives of your relatives and your loved ones (if you have to stay to look after your ill mother, for example). Now, can such a violation be called treason ? I believe it can, to a certain extent, given the fact that Israel is a tiny country under pressure and under immense threat. Israel needs Galut Jews to come and strengthen the Jewish state, the Jewish army, she needs Galut Jews to come and bring their skills, their resources, their commitment. If, G-d forbid, Israel was badly hurt in the next predictable phase of hostility with Arab Nazis, then Galut Jews would bear their share of responsibility.
I emphasize that what I am saying applies to Jews who claim to be Torah Jews, not to ethnic Jews who have chosen to assimilate.
Now, what should be the punishment for that form of treason ? It's not for me or anybody else to decide, this is clearly HaShem's prerogative. My personal belief, rooted in the Torah, is that HaShem judges individual Jews with infinite wisdom and understanding of every aspect of each Jew's individual situation, and that He is a loving Father to His people. Staying in the Exile just because you have a high-paying job there and you are afraid to earn less in Israel seems to me to be a wrong reason. But there can be more serious obstacles, and HaShem is aware of them.
Now, all that I have discussed was about Jews in the Exile in general. As for Jews choosing to stay in Germany, I would be much more assertive in saying that it is a form of treason. I am not going to repeat all I have already said in this thread, the bottomline is that it is obvious that there is something special about Germany ! To me, a Jew who doesn't view himself as assimilated and who chooses to live in Germany had better come up with a very convincing explanation for making that decision. Claiming that it is difficult to move because of language barriers or job search is not enough, this is just looking for an excuse.
Finally, not all forms of treason are on the same level and I think that there are Israeli Jews who are much worse traitors than Galut Jews, especially the Israeli Jews who harass the Jews of Judea and Samaria.