When I was in teacher training, we had a very short lecture on SEN. No discussion about different needs, mental, physical, behavioural - nope, just an hour on the fact that we will encounter children with SEN in our classes.
I am against 'inclusion'. Many teachers are, but we can't say it officially. Why should one or two children with extreme problems be in my class and ruin the education of the rest of the children? Some schools are better than others - some have the funding to give these children the one-to-one support that they need. Most don't, or pretend not to so that they have more money to spend on other things.
I sympathise with parents of SEN children. I feel that they are not getting the best for their children in our state schools. In special schools, children are looked after and taught according to their needs and abilities - in state schools the children are sidelined, 'looked after' by unqualified, unwilling staff (no blame on them, they didn't sign up for it by the most part) and generally not learning as much as they could.
The fact remains, though, that many classes I have taught have been made so much more difficult by the behaviour of one or two (sometimes more) children. Imagine trying to teach the rudimentaries of fractions to Year 3 children when one is screaming obsceneties and smashing things up in a corner. Don't laugh - this is a true example. Or when I'm teaching Year 6 about writing using flashbacks, and a SEN child is wailing the whole time, loudly. Even though by Y6 the kids are trained not to react, it's still distracting for all of us.
If my child had Special Educational Needs, I would want them to be in a place where they were cared for, looked after and taught what was appropriate to them. None of this happens in most 'mainstream' schools.