How come Obama left out of his speech the Arab states responsibility for the plight of the Palestinians?

Because he agrees with them. And Galloway was right--it's an ideology, and "peace to your fellow man" is NOT in the doctrine. They build themselves up on the falsehood that you have to do all you can to destroy infidels and that is your only goal. Where would you find any compion in all of that? So, Obama in my opinion agrees.