The basic concept of justice, however, requires that there be some compelling indication of guilt before a verdict (legal or personal) is reached and consequences are doled out. As long as lying exists, and can provide so many advantages to people who do it well, an accusation alone can't be a compelling indication of guilt.
If it's not "innocent until proven guilty" then it must at least be "innocent until you know damn well they're guilty."
I'm not convinced even that standard is being met in all cases.