I'm not dismissing it, but unless you have power over someone involved, there's no reason to pretend you don't have an opinion until after the trial, or to unquestioningly accept the verdict. In this particular case, there's enough evidence already available to draw a nonbinding conclusion. Of course you should still pay attention to any new evidence or testimony in the trial, and don't dismiss the result if it disagrees with your early conclusions.

But it's ok to think OJ was guilty, it's ok to think Arpaio is guilty, it's ok to have an opinion about Julian Assange even though he hasn't been tried.