I think the point how I see it is that it isn't really an opinion as such being expressed by him... what he has said may well be underpinned by an opinion but the expression of it is anything but.
I do agree that opinions - if backed up by sound logic - should be let be. The problem here is the logic behind it hence all of the comments following on from it.
By calling it an opinion is kind of sidestepping the point of what has been said.
You express your own opinion and believe it, wether other people do so is their choice. By trying to argue the merits of their opinion as opposed to your own is fine aslong as people do not cherry pick certian points.
that is my opinion anyway
