You can of course discuss whether a thing is good or bad, even before it has been proven a fact. As an example, you could discuss whether it would be good or bad if it turned out that Trump fucked a minor in the presence of Epstein. Doesn't have to be proved first. You can still discuss whether it's good or bad. You could even discuss things that are totally hypothetical: if we colonize the moon, should we make murder legal or illegal on the moon? We can answer that question even if it hasn't happened yet.