I'm appalled at the abuse and violence on this thread, and don't defend it at all, and I definitely think teachers should be able to report to the police, a big change is needed and this covering up has to stop.
BUT...
I do think there is (and has been for ages, since I was at school) a problem in UK schools with nitpicky, stupid rules and an "us and them" attitude to kids, which fosters an "us and them" attitude to teachers. Obviously not all schools/teachers but the general culture. (I had some fantastic individual teachers who changed my life so I am not slagging off teachers.)
Uniform is a classic example - I was a very well-behaved, hardworking, A-grade teenager, but being told off for minor uniform infringements or not sticking to bloody stupid rules about which door you could use instead of walking a mile round the other way, made me really disrespect the school and many of the teachers. A really clever, bright boy in the 6th form was constantly harassed for having long dyed hair. FFS who cares if he is doing well and a nice person? I was bright enough to see that uniform is actually irrelevant and I would have preferred them to focus on dealing with disruptive behaviour and violence in the worst kids and give the rest of us a break.
I actually left at 16 because I couldn't stand being treated like a baby, and continued my education elsewhere.
That does NOT excuse behaving badly (and I didn't and nor would I stand for my DC behaving badly at school). But I do think if schools were less about pointless rules and obedience, and more about mutual respect and learning, a different culture might develop. I was really cross when I saw that news item about excluding kids over uniform. Unless that HT has dealt with the things that really matter (which seems unlikely going by this thread) then uniform is a red herring and that action will just piss people off.
I went on a german school exchange as a teenager and it was so different. No uniform, no ridiculous, personality-crushing hair rules (I am OK with sensible rules like tying long hair up, as long as a good reason is given), no out-of-bounds areas at break, kids milling around happily indoors, socialising or reading/doing homework as they chose, or playing sport if they chose. Kids on first-name terms with teachers and generally treated as if they had some maturity to start with. There was bad behaviour among our UK group and the german teens were just baffled - they saw no need for it.