The legal concept of innocent until proven guilty is at the very foundation of our legal system. If you think your friend was abused by our system, imagine what she might be going thru in system that presumes guilt. If you vote right, and work for change in other ways, you can help make our system better, and hold abusers such as those who abused your friend accountable.
As for what the pitchfork weilding masses believe, it really doesn't matter so much, so long as they don't vote for an authoritarian leadership that will begin acting as if it is outside of the rule of law, and therefore not bound by such legal precepts as "innocent until proven guilty".