windward - the school i taught in was before 'the last few years' with the knives etc.
there were 2 separate incidents in my classroom when i was teaching, when pupils were pulled out of class & had knives in their bags. one wanted to 'get someone after school' another just wanted to show off his collection of fighting knives. those 2 times were pupils i was teaching, with the knives in a bag by their side during my lesson. neither time were they reported. the pupils were given a fixed-term exclusion then allowed back into school.
another time one of the pupils in my form group was using an air rifle on his way home from school - he'd been carrying it around with him all day, so he & his mates could 'mess about' with it after school. they were aiming at the younger kids & having a laugh.
again, that never made any stats that you would see, police were not involved. these 3 occasions took place over a period of 5 years, and were ones where they were pupils i had had in my classroom that day. other staff could tell other stories from that same 5 year period, including one serious arson attack (police were involved). oh, and my car was hit & kicked by pupils who recognised me when i was taking another pupil to hospital. these schools can and do exist. the entire school system isn't 'crime ridden', but in some schools it is just expected that teachers will work within these conditions.
even in 'good' schools, a certain tolerance for verbal abuse, and attempts at bullying etc are expected. in fact, teachers are seen as 'weak' if they can't manage and control these situations. I don't think there are many other careers where such pressures are seen as 'just part of the job'.
so, you see, a lot goes on in schools that 'official authorities' never know about.
i know that my experience was kind of 'specialized' - i taught in a very 'special' kind of school, although not a pupil referral unit. however, those situation can & do exist, you can't just dismiss them because you have not personally encountered them.
the point i'm making, is that when comparing salaries, people look at the holidays, the security (which ARE valuable, in monetary terms), but don't actually look at the responsibility. I was happy with my pay, and went into teaching knowing what it was. BUT I still think that being responsible for the learning of hundreds of pupils, leading a dept with 15 staff, the hours & pressure etc, do NOT compare well with similar responsibilities in private industry.
my pay when i started teaching (1995) didn't even compare well with other graduates i knew working in universities, so again, public employees. teachers' pay did slowly increase during my first ten years, but i could never compare with friends of the same age, who were doing research & a bit of 'lecturing' within local universities. their teaching hours were significantly less stressful & their qualifications pretty similar to many teachers.