So UQD you feel 'hectored' when someone asks you direct questions which are trying to make some kind of sense of your rather nonsensical arguments - aah, poor thing. Good lord, how did you cope in your grammar school if a few questions make you feel 'vexed' and 'hectored'?
Really, if your vision of improving education involves a return to a grammar school system and your only real criticism of private schools is that they're not, well, grammar schools really and your only criticism of comprehensives is that well, they're not grammar schools then there's no point in continuing the debate.
There are few people who believe that grammar schools were, are or would be fair and would offer anything more than a selective education to the children of parents who are already privileged paid for by the taxpayers while excluding the majority of their kids.
And it completely ignores the problems in education which are not the achievement of the middle-class who are doing just fine (either in private education or in faith schools or in schools in leafy suburbs and even in their local poorly performing com when their parents are brave enough to send them there).
Middle-class kids are doing fine academically. Better than they've ever done. They get their 5 A-Cs grades at GCSE (often more As than Cs), they go on to pass their A levels, they go on to university. Grammar schools (in order to be grammar schools would have to select the top 1/3 to 1/2 of students). It doesn't take a genius to realize that the parents who would swoop on these places (by any means possible including making sure their kids were in the right feeder schools, had tutors, were fed a good breakfast on the morning of the exam, got the past papers and made their kids sit them etc, etc) exploiting yet one more advantage available to them for free WHICH THEY DON'T NEED.
I know you have a rather take it or leave it (and probably more likely to leave it) to EVIDENCE but there is plenty of evidence that middle class kids are doing well and would do well academically even if they were sent to poorly performing comps. I went to a comp (after the 11 + was banned)which has since been put in special measures and then closed down and actually did better than my sister who went to what was a grammar school for the first couple of years she was there (I think she was put off by being a small fish in a big pond whereas I was, you get the idea, oh and the Latin). I teach kids all the time who get As at A Level and go on to top universities (including Oxbridge) who have been to really amazingly poor comps but have middle class backgrounds or supportive backgrounds or parents with incredible aspirations or amazing amounts of gumption. Like your kids, no doubt, most kids with supportive parents with some education or aspiration themselves will almost always do well.
Of course, there'd be the exceptional kids (and they would be exceptional) who lived in a council estate whose parents had aspirations for them or who had enough 'gumption' or supportive enough teaching at primary level to go out and get the past papers for themselves who managed to sit and pass the 11+ (because how else would you select?) but they would be rare and their brothers, sisters, cousins and neighbours would go to the 2nd best schools and never recover from the rejection.
And how deeply patronising and yes, stupid, that you suggest that seeing secondary moderns as 2nd best was simply a matter of 'perception'. The students who went there were failures, they knew they were failures, everyone knew they were failures however bright and however much potential they may have had. Of course, the 'best' schools, as now, are going to attract the best teachers, the best resources (and it has been pointed out to you many times that grammar schools were better funded than the alternatives).
I don't blame the parents who chose or choose grammar schools BTW any more than I really blame the parents who adopt a faith or move house. If the system allows the middle classes to exploit it and reap the benefits then you can't blame them for doing just that. And I'll tell you what if there were grammar schools in my area it would be my kids who would be first in the line and getting the extra help (quite easy for my kids since dp and I are both teachers) and getting the place and not my neigbours who have none of our academic advantages.