Well, that, yes, and it isn't right. That very statetment was kind of /0 in that it was already an opinion.
And we reach the base of the problem, and that is, is it an opinion or a fact? Seeing as history is a gigantic generalized opinion that we base most things off of(just like any other school subject), it is, in fact, both due to it applying to everyone and the fact that I said it.
Fact: it applies to everyone and always will.
Opinion: I said it, therefore, it is my opinion.