Your definition is right but there are also other definitions of opinion.
Quote:
o·pin·ion /əˈpɪnyən/ Show Spelled[uh-pin-yuhn] Show IPA
noun
1. a belief or judgment that rests on grounds insufficient to produce complete certainty.
2. a personal view, attitude, or appraisal.
3. the formal expression of a professional judgment: to ask for a second medical opinion.
4. Law . the formal statement by a judge or court of the reasoning and the principles of law used in reaching a decision of a case.
5. a judgment or estimate of a person or thing with respect to character, merit, etc.: to forfeit someone's good opinion.
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look at the second one.
It's also a personal view, attitude, or appraisal.
So my opinion DOES NOT have to be right.
And it makes sense to me.
Just saying