We in America may not blink when someone uses the Nazi comparison since it is done so much and with absolutely zero validity, but when the Israeli prime minister uses it, pay attention:
Israel has identified Iran as the greatest threat to the Jewish state. Israel's concerns have heightened since the election of Iran's hard-line president, Mahmoud Ahmadinejad, who frequently calls for the destruction of Israel and has questioned whether the Nazi genocide of 6 million Jews took place.
"We hear echoes of those very voices that started to spread across the world in the 1930s," Olmert said in his speech at the Yad Vashem memorial.
This comparison is not being made lightly. If we don't do something about Iran, Israel will try to do something. And they can't strike Iran as effectively as we can, nor can Israel support a revolt. Which makes it even more important that we do the job our way to stop Iran under the mullahs from going nuclear.
To Israelis, never again means never again.