The trouble is that propaganda is most convincing for the propagandist himself. And, after you convince yourself that a lie is the truth and falsification reality, you can no longer make rational decisions.
An example of this process surrounds the most shocking atrocity of this war so far - the shelling of the UN Fakhura school in Jabaliya refugee camp.
Immediately after the incident became known throughout the world, the Israeli army "revealed" that Hamas fighters had been firing mortars from near the school entrance. As proof, it released an aerial photo which indeed showed the school and the mortar. But, within a short time, the official army liar had to admit that the photo was more than a year old. It was a falsification.
Later, the official liar claimed that "our soldiers were shot at from inside the school." Barely a day passed before the army had to admit to UN personnel that this was a lie too. Nobody had shot from inside the school and no Hamas fighters were inside the school, which was full of terrified refugees.
But the admission made hardly any difference any more. By that time, the Israeli public was completely convinced that "they shot from inside the school" and TV announcers stated this as a simple fact.
So it went with the other atrocities. Every baby metamorphosed, in the act of dying, into a Hamas terrorist. Every bombed mosque instantly became a Hamas base, every apartment building an arms cache, every school a terror command post, every civilian government building a "symbol of Hamas rule." Thus the Israeli army retained its purity as the "most moral army in the world."
http://www.morningstaronline.co.uk/news/features/moral_insanity_and_slaughter