The issue is that she alone decided what was to be deleted as "personal." She has implied that they are about trivial matters like her yoga classes and Chelsea's wedding plans. If she deleted any emails that could be embarrassing -- whether involving State Department business, Clinton foundation business, foreign donations to the foundation, hubby's foreign speaking engagements, private opinions of President Obama, etc., etc. -- she will look bad. She keeps saying that she didn't do anything illegal. Even if that's entirely true, it doesn't mean that her emails won't affect judgments about her.