Upon first reading Lou Cannon's column ("The Reagan Presidency: Every Night at the Movies," Opinion, April 28), I was inclined to laugh. There were, after all, a few of us who suspected Ronald Reagan and his Administration were little more than a Hollywood back lot from the start; pretty from the street but held together from behind by shaky props. The more I've thought about the article, however, the more upset I've become. Wasn't there somebody in Washington with guts enough to tell the American people about this facade of a man? Where was Lou Cannon with his then-18 years of covering Reagan? Where was the rest of the Washington media?