Oh, that's rich.
This is just the latest PR stunt by "The American Freedom Defense Initiative" a rabidly anti-Islam group that insists every single Muslim is a radical bent on genocide.
This ad, according to the Washington Post, features Adolf Hitler talking to Haj Amin al-Husseini, the grand mufti of Jerusalem who supported the Holocaust.
AFDI claim their ads are a response to "the vicious Jew-hating ads … unleashed on Washington DC Metro buses last month.” by American Muslims for Palestine:
The AMP ad, reminding Americans that some of their tax money goes to Israeli aid, it certainly politically charged. But it just doesn't seem quite as over-the-top as the response.
Perhaps all sides of religious conflicts should make an agreement not to judge each other by the acts of their worst zealots, or the bloodthirsty and weird writings of their ancestors. We can debate US foreign policy until we're red, white, and blue in the face, but the only sure way to lose the argument is to succumb to Godwin's Law.