[pessimizer]

I think the selective memory comes in when people claim that there weren't a huge number of people that thought and proclaimed loudly that the evidence was bunk at the time. It's the same type of historical retcon that happens when people say that no one could see the housing bubble coming, and that everyone during slavery/segregation thought black people were inferior, so no one should be judged terrible for it because they were "of their time."

The television was always sure that the war was necessary, that Powell's speech was coherent, and that the government always knows best because it has access to secret sources that it can't reveal and our best interests at heart. Of course, the television is also in the arms business.