Pubdate: [Mon, 25 Nov 1996] Source: Star Ledger (NJ) Author: Gerald M. Sutliff One of your readers was "horrified" at a Doonesbury strip poking fun at the California attorney general's effort to protect sick people from medical marijuana. Doesn't he know that we humans try to laugh when confronted with pain and suffering caused by stupidity and the insanity of doing the same thing, year after year, and expecting a better result? Your writer shouldn't worry if his children understand the joke because it's too late to keep them shielded from the truth. Gerald M. Sutliff, Walnut Creek, Calif.