It's easy to see that you don't teach, and have no idea of the dynamic in a classroom. Dealing with upwards of 32 16 year old students all with differing needs and levels of attainment in a mixed ability class, in the confined space of a classroom, normally without a TA, can be like herding cats. I am sick to the back teeth of people in 'management' telling teachers how to do their job. Our job is to teach a subject to students, not to have to take on board 'good personnel management techniques'. We'd all be working in HR if we'd wanted to do that. Standards in education are slipping not because a 43 year old with a degree says bollocks on MN; but because students are allowed to be disruptive in school and aren't dealt with effectively and firmly enough early on by SMTs or their parents.
You deal with adults who are totally different to children. With adults in employment you have a carrot and a stick. If you are good at your job, you'll get paid for it, if you are not, then you won't, as you may be on warnings, and then lose your job, with all the attendant consequences. Having worked in another sphere for 10 years before I went into teaching, that is how it worked.
With children, especially those in KS4, there is no stick that can be effectively wielded by the teachers; as we are not allowed to use strong sanctions with the students, and they don't in many cases give a damn. They are also, when they disrupt a class, interrupting teaching time and the learning time of others. Perhaps you think that having to deal with disruptions that then eat into class time is an acceptable use of a teachers time; and don't mind all those who want to learn being failed by the disruptive children about whom you are so concerned. I do mind and I don't like having to interrupt a lesson again because certain students don't feel like participating.
I don't know where you work, but where I worked, putting my head on the desk in front of a client would have been cause for a reprimand at the least; in my highly skilled and educated dh's job it could cause death or injury or damage to millions of pounds worth of unique equipment. 'Sorry, we dropped the periscope (the only one in the world), as Sir had his head on the deck, he wanted a bit of a rest'. I don't think so. If you are in a job you are paid to work, not put your head down; that is what your lunch time is for.
How do you know, apart from the OP's post that the child was sent out for 'no reason'? You only have her side of the story. This teacher could have been dealing with constant low level or high level disruption from the same student for weeks. SMTs are scared in some schools of removing students from the classroom, so they have a word with them, they promise to be good, you have them back in class, and it happens again and again ad nauseum and ad infinitum.
I am by no means a dictator, (and I would like to see your evidence for saying so). I do however have a set of rules of how I expect students to conduct themselves in my classroom. Every student from year 7 to year 12 copied these into their books, and the consequences of not adhering to the rules were explained.
When you have students coming into school who haven't got to bed until 0100, and they are 12, then yes, bedtimes are important. If the children are too tired then they are disruptive and don't learn; hence the notes in the planner. The same children would try to get through their day fuelled by Red Bull either given to them by their parents for breakfast, or purchased at the local superstore on the way to school. There are probably 3 students like that in every class. Some teachers see upwards of 18 different classes a week, minimum, depending upon the subject they teach. The implications are obvious.
'The children that you have had removed for "stepping out of line" so that you could do your job have been failed by you, but I guess you don't care about them, so long as it made your job easier.' Mmmm, you'd know all the kids I taught would you? The ones who I removed who have gone on to Uni and good solid careers; for whom the penny eventually dropped that it was their education they were hurting, and their own prospects, by their behaviour. Some, yes, whatever you did, you couldn't help, but then, neither could anyone else, and it wasn't for lack of trying either.
'Teaching is not done in vacuum, a teacher has to teach real live children and inevitably some will misbehave.' I think most teachers have figured that one out, and that we also possess 'experience, empathy and an understanding of human psychology' because we cope with the disparate needs in some cases of up to 600+ differing individuals a week, let alone any contact we may have with colleagues. Teaching is an art imo.
I've worked on both sides of the fence, teaching and not in teaching, so I have experience of both worlds, and teaching was by far the hardest of the two. I suggest you do a couple of terms in the classroom in a comp dealing with students, planning and marking, and the compulsory Masters degree course that is now being introduced, and then see if you have the time or the energy to apply your personnel techniques.