What I'm not entitled to is to expect my opinion to remain unchallenged.

Exactly, Steve, but there is challenge and there is challenge. If I were to challenge your opinion about the great Mr Shankly with a counter opinion about, say, Alex Ferguson (Not that I would you understand, this is for demonstrative purposes only) we would then get into the realm of who won most trophies etc. etc. But, as I have said before, that is not the whole picture. We then become involved in the type of circular argument that so often becomes the norm here and, in this case, based on just one aspect, you lose ;-)

By refusing to state why we arrive at a particular opinion, the opinion is not necessarily any less valid. In my opinion of course.