Why shouldn't schools train anyone & everyone who cares to train?
The contract between the student & the school is for training only, not 'train & get employed'.
My only exception is if a school is misleading with the truth ie promises or insinuates that employment will occur as a result of training with them and without a formal guarantee such as a formal cadetship in association with an airline.
In my instructing career I always, but always, emphasised that getting the licence is the easy part (no matter how hard it seems at the time!) and getting a job at the end is usually the most difficult. I also emphasised that very few of those who get employed ever get into an airline. Can't say I noticed any difference in training commencement rates in any of the figures I maintained. Indeed, some students later told me their decision to start was - in part - due to my being so forthright.
As with any task in life, do your homework before committing.