Yup, one should neither blame nor discriminate against former foreign teachers of training centers.
Most of 'em had initially made the mistake of taking a position there on account of the misleading and slick advertising, and higher than average salaries offered by such outfits, as well as the ease that foreigners not holding bachelor's degress can get such jobs due to dishonest training center bosses being able to wangle Z visas for their foreign teaching staff without such tertiary paper qualifications. Maybe there are also some willing workhorses among job applicants who have a genuine desire to bite the bullet of doing the job well as opposed to going through the motions of doing it without necessarily achieving much, which is what many foreign teachers do in Chinese classrooms at public schools, colleges and unis packed to the gunwhales with students. The latter situation is always a lose-lose scenario for students, but money for old rope for lazy foreigners, of which I'm one, and unashamedly so! Why work yourself to death for a high salary when you can have an easy life for a salary more than 1/2 of a high one by working basically parttime hours by western standards without any pressure from your head of department regarding your teaching?