That bullets could fly at the National Zoo on Easter Monday was horrifying but, in a country that lets its handguns do the talking, sadly unsurprising. . . . Youths have always scuffled; but today, scuffles too often turn into tragedies that couldn't happen were guns not so accessible. Congress doesn't hear gunfire unless it's in a school or maybe at a national tourist attraction like the zoo. Then speeches are made and proposals are introduced, diluted and abandoned. The most sensible proposal - to ban handguns and assault-style weapons - gets no hearing. Will public concern bring more pressure to bear at election time this fall? Or will the country simply stand by for the next gun tragedy?