That TA in the class that does 1-1 with the child that had additional needs is not funded by the school, but the LA, and a parent had to probably go to tribunal in order to get that level of support for their child.
What they are NOT doing is taking away from the school funding and the education of others. They are not there to support other children, although many do despite it not being in their job description.
Sorry, just the pass gag What's App group has really depressed me today.