Please may I give my first impression before reading 9 pages because I have to go and do something else? Thanks.
You are not being unreasonable. Actually, Teachers have no right to promote any lifestyle choices above others apart from safe sex and anything to do with the law. Possibly if it is part of the curriculum and relevant they may teach the science of eating meat and that it has been found recently that we do not need to eat as much as once we thought - so long as the scientific evidence is there to support this.
I was a Teacher and taught the whole age-range from pre-school to University. I do not agree with Teachers giving their personal views on anything, they must stick to teaching what they are supposed to teach. In personal tuition and personal care, however that is carried out, the teachers must not give their views and beliefs but support the child bearing in mind that child's background. Some pupils may have parents who are Farmers, Stock Men or Butchers.
Some of these Teachers need to consider what the countryside would look like if we stopped raising sheep and cattle for meat. The fields would be empty. Maybe there would be a few such animals in a zoo. Animals which are well cared for and humanely slaughtered with no stress by being stunned away from the slaughter place do not suffer and have good lives.
Please though, join me in writing to your MP to ask that we ban the practice of non-stun slaughter. It is inhumane and barbaric.
You may be interested to know I do not eat meat. I do drink milk.