Because literature is not vital, that's why. Well, not vital in a violent age. History is to blame for your fate. You are a victim of history. It's only natural that having got literature out of your system you will, first, want to study history and then, take your revenge on history.
Somebody has to pay for the mess history has made of life.
Ordinarily a country manages to get by with 10 or 12 historians per generation. With the historian explosion created by Vietnam, however, thousands were suddenly coming down the pipeline. Newspaper editors could print only a limited number of letters correcting foolish reporters' errors about Benedict Arnold and Mary, Queen of Scots. Now they are going at it with gusto. No reputation is safe anymore.