I wouldn't mind you campaigning, if those 1854 supporters, who have signed your petition, all had experience of SEN, all had experience of 'inclusion' in MS, and all had experience of Special Schools to make a judgement.
The majority of those 1854 respondents, will instead be signing because of their misconceptions. 'Inclusion' doesn't work for very many children with SEN. Just hang around these boards for a week or two, to see what parents are having to do to try and secure effective 'inclusion.'
Those parents who want MS education because they view it as 'best' are not actually that plentiful. There are many more parents who view it as 'the only option', because there are very few specialist schools for children who are academically able but socially vulnerable, due to their SN, and those that are available are independent schools.
BESD schools are full of children who have major behavioural difficulties and are not a suitable environment for children with neurological SN.
The special schools that are available are increasingly taking children with Severe Learning Difficulties and Profound and Multiple Learning Difficulties. Those children with Moderate Learning Difficulties who would, in times past, even recent years, have gone to special schools, have been pushed out into MS schools with barely any support. If they are lucky enough to have 1:1 support, it is usually given by someone who has no SN experience.
Long term, the more skills a child can learn in child hood, the more they can close the gap with their NT peers. DD1 is learning far more in SS than she would have done in SS. There are people who fully function as adults, who went to Special Schools as children.