I agree that "ant-Semitic" doesn't have a clear meaning. The real distinctions are, "who wants Jews killed", "who doesn't care if Jews are killed", and "who doesn't want Jews killed". While even that simplification may be too complex for some, it does define the issue. In WWII, the Nazis and the Muslims wanted the Jews killed, FDR and the Allies and Europe didn't care if the Jews were killed, and few but the Jews didn't want the Jews killed. Today, The Muslim World wants the Jews killed, Europe and the Israel-haters in the US don't care if the Jews are killed, and Jews don't want Jews killed. Once that issue is defined, the next most significant issue is, "who will act to keep Jews from being killed?" The answer is, "only Israel". Others may make speeches, but they will not act. It is a much simpler matter to anguish over a Holocaust that has already occurred, than it is to act to prevent one that is threatened.
Brazilian head of UN peacekeeping force in Haiti dies of heart attack (Reuters)
from the article: Jewish critics who betray the struggle against anti-Semitism