I had a look at his post. It's drivel. Any teacher propagating any political agenda would be warned, suspended and then out on his/her ear, according to standard disciplinary process.
I suspect what he actually objects to is teachers teaching the national curriculum (which doesn't map to his...
A good pal of mine was a forensic social worker. He has interviewed many people resident in 'secure hospitals' (like Rampton) when they request release on the grounds of 'no longer being unwell'. His strategy was just to let them talk. Eventually, and more often than not, they would come out...