Fast, the argument I am making is of the 'you only need 1 black swan to prove that not all swans are white' variety.
The problem with that argument is that you could make it about nearly anything - such as secondary moderns providing a great education that doesn't disadvantage anyone and gives kids all the opportunities they need. Philoslothy's kids who went from secondary modern to top universities are your black swan. So what's the problem?
There are those on here who claim that the ONLY way of getting their child into an environment that challenges the able, that values hard work, that has an academic ethos etc etc is through the grammar system. Ergo, we must keep grammars.
I think the problem is that there are a few different question intertwined here. One is "what would the best education system look like in an ideal world?" Another is "what is the best solution for my child, within the education system that we have?"
My answer to the first question probably wouldn't be a selective system (although it probably wouldn't look much like the current system, either). My answer to the second question is to make use of the excellent grammar school we have available up the road.
You seem to be insisting that any parent of any child, living within the current system as it exists and operates, ought to be able to get an excellent, appropriate education for their child without using the grammar system. I'm sorry but I think you're delusional in that impression. Maybe you're just out of touch because your school is in a nice area and you don't know how things really are for so many others, I don't know.
My feeling on that score is not just based on the secondary moderns here, either. We moved out of a comprehensive area to this one partly because our oldest's primary school "education" was so severely compromised by exactly the things I've referred to, and partly because the secondary options there were so dire. Fortunately we could afford to move to a reasonable area with grammars schools - though not to a posh expensive one with great comprehensives.