As a school governor, I chaired a panel where we ended up excluding a child; I have been a school governor for over 30 yrs, it is the first time I have ever had to do it.
No one goes into those panels wanting to exclude a child, but if we are the wrong setting for that child, then this is often the only way to get the LA to take appropriate action for the child and to ensure that they get the support that they deserve. I have sat in discussions with Headteachers and staff who have gone way beyond the extra mile but when staff are being physically harmed, when the rest of the class have to be removed so that the a child can be de-escalated safely, there does come a point when a line must be drawn.