@maxdancona,
There are ways that such a conclusion can be justified.
For example, if what he is accused of doing is not even a crime, then it is reasonable to say that he has not committed a crime.
Or, if all the facts are already known before the trial, it is reasonable for someone who is familiar with those facts to draw an early conclusion.
Also, the mere principle "innocent until proven guilty" means that people should be presumed innocent if there has not been a trial.