When Kim Jong Il, the former head of state of North Korea passed away, the people were in deep grief. They were genuinely devastated about the loss of their dear leader.
People from outside the country, who have read widely about the negative aspects of this leader, were surprised why the people in North Korea adored him so much, and the adoration was genuine. They overlooked a reality - the people were influenced regularly and for decades by the state controlled media about the greatness of their leader. It may be subtle, but it was most powerful.
This is the influence of the media.