zazi, you are a teeny bit naive if you think that public funding means that children are not excluded because of parental income. There has been so much research that indicates any barrier to a school i.e. faith, transport, 'ability', 'aptitude', fancy uniform etc, etc leads to a corresponding reduction in intake of children on free school meals.
'wouldn't a state school which determined or prioritised admissions on a catchment area, giving priority to children in the local area, also be considered a form of exclusivity?'
Well, of course, that depends on your catchment. If you need several million to buy a property within the catchment then yes. Many people would like to see an education system where the local school is a good school for EVERY CHILD.
'I believe that any single education programme cannot address the needs of all students and communities.'
A 'single education programme' by which I assume you mean comprehensive education does not mean a homogenised education. A single school should be perfectly able to cater for the needs and aspirations of all of its pupils offering support and challenge and a range of academic and vocational subjects.
I have always struggled to see how a 'specialist sports college' or 'specialist musci school' benefits has a particular benefit for those pupils who do are not sporty or musical. Interestingly, the school near me which became a 'specialist language college' saw its results in languages and the number of people continuing a language at A Level drop after receiving this status.
Since you cannot have as many schools as there are children it is common sense that EVERY school should be able to meet the needs of EVERY child bar those who fundamentally cannot cope with mainstream education (i.e. those who attend schools for EBD).
'It seems to me there is this general idea on here about fairness and anti-exclusivity, which when taken to the extreme, means that if a exciting educational offering can't be made available to everyone, then it shouldn't exist at all. How sad!'
But who on earth is arguing for this extreme? I've never come across a school or a person who says 'no we can't offer x, y and z to everyone therefore it shouldn't exist'. That's just stupid scaremongering.