All through Order of the Phoenix, Harry and Dumbeldore and the others have a very hard time conveying to others the truth of Voldemort's return.
This is a situation that we all can understand - sometimes the truth is so scary that a lot of people would prefer to ignore it.
I believe that this is exactly what's going on right now in Israel. Even as most governments of the world, even some Arab governments, are supporting Israel's need to defend its citizens against years of terror, others (especially the media) are refusing to accept the reality of Palestinian terror.
The video clip below conveys the point very well. Hopefully, if the world can realize the truth, we can find a way forward from there that will succeed in bringing true peace, peace without terror.