ok how about this
Hitler was a good person
That's still an opinion that's neither true or false, because that's what someone may personally think of Hilter. A judgement, viewpoint, or statement doesn't need to be agreed with the majority of people to be a opinion.
What's the difference between an opinion and a fact if you think they can both be true or false? Stop acting so smart just because someone's opinion on something doesn't align with yours.