You mentioned the newspapers' content being for sale. People prefer to communicate with each other directly, not through impersonal media, which they see as entertaining and useful but do not worship. Newspapers are a very minor factor in general. All 23 Mexico City dailies have a total circulation under 800,000. I don't see the print media ever becoming an important force among the masses of people.
Print is too abstract for the Mexican personality, too removed and pallid.
Television is very big, of course, and people do trust TV news because they can see the action, but they don't rely on TV content for opinion. They are very aware that all news is controlled and manipulated. He was fired. He's now in radio. Some of this seems to be changing.