It is what 'should' be, yes. But for her, it is the worst possible strategy. At this point, she does not know what her tormentors know. She could in 'coming clean' either fail to answer an issue correctly, add fuel inadvertently, or open an entirely new line of investigation.
Hillary and her paid staff are well aware this is a long game. It is to the Republicans advantage to spread this out over two years. It is also to the Obama camps advantage as well as every other wannabe's to have it drag out, so long as it does not spread to the Oval Office.
So the best strategy now is nothing. Wait. Let it die from the headlines and see what has legs and what doesn't. It the attention span of the voter is any indication, she has them on her side