For the rightwardly inclined, the Clinton email scandal is about "Benghazi" and national security. For normal people, the issue is Clinton Foundation corruption. Erasing all the "personal" emails could have zapped any evidence of improper dealings between the Clintons and various "donors" hoping to influence policy while Mrs. Clinton was Secretary of State. See Michael Hudson [Real News / YouTube] and Greg Palast.
See also Clinton Foundation Timeline.
Bernie Sanders was the only decent alternative to more years of icky Clintons and you'd be forgiven for having a sick feeling in pit of your stomach when he endorsed them ahead of the Dem convention.