You can have an opinion that is grounded in basis of logic or fact.
In my opinion, the sunset appears pinky/purple. The basic foundation of this opinion (which others may disagree with due to slight variations in atmospheric conditions) is still rooted in fact. Someone else may think it looks red/purple. Both are basically correct, reasonably speaking.
https://news.ycombinator.com/item?id=5702337
You’re right, there are NO valid opinions, my bad.
“An opinion is a judgment, viewpoint, or statement that is not conclusive, rather than facts, which are true statements.”
You can have an opinion that is grounded in basis of logic or fact.
In my opinion, the sunset appears pinky/purple. The basic foundation of this opinion (which others may disagree with due to slight variations in atmospheric conditions) is still rooted in fact. Someone else may think it looks red/purple. Both are basically correct, reasonably speaking.