People in a country like Canada use their own media - public (CBC) and private (CanWest, TorStar, CTVglobemedia) - to know what is happening in their own country. Media are also an important part of forging a national identity. They are supposed to represent the broad spectrum of Canadian opinion. When they present information on the rest of the world, they do so from a Canadian perspective and have the Canadian audience in mind.
And today, if you want to have the first idea what is happening in Israel/Palestine (or most of the rest of the world), the best thing to do would be to turn them off completely.
In the face of a major ongoing crime like that of Israel's siege and assault on Gaza, Canadians turn to the Canadian media in good faith to try to learn and understand what is happening, who is to blame, and what they might be able to do to help the victims. On each of these counts, the Canadian media fails.