I must compliment you on your very professional way of handling the situation with that open letter, but that does not excuse the fact that your school is most likely to be not such a great one. In fact, I feel slightly disappointed by the lack of Chinglish for us to point out and ridicule on this occasion, as I love making those little buggers squirm.

What I will say about the letter, is that it serves as a warning for those foreigners that wish to work in a training centre. Even if the boss or co-founder etc has the best intentions at heart, the vested business interests of what is ultimately just another private company with local business partners will prevail. What's more, training schools not only contain Chinese staff with questionable ethics, but will attract the type of foreign employee that is not of level that would usually be recruited by a good public school or university.

As you admitted yourself, there is a tendency to come across quite a few inexperienced brats that aren't used to not getting their own way, not to mention those who are avoiding the world of real work in the West, drink irresponsibly like they are still at college or get stoned all the time just because Mummy and Daddy aren't looking... Then you get the really creepy older individuals like those with extensive criminal records or paedophiles on the run. Therefore training centres can be stressful and uncomfortable places to work as you can quite frankly speaking, be thrown into the great big melting-pot of all those who have failed in life. That unfortunately means that you can't count on colleagues to be there for you, as to be honest you wouldn't even want them to give you their useless 'support'. Training centres can be lonely and horrible places to work indeed.