Oh,im not denying that they don't start with the best intentions.It's when they realise what a hard bloody thankless task they're doing and basically they get shafted by (our) government and the workload gets increased and increased and increased.That's when they lose all enthusiasm for it.Believe me i had some bad teachers and i also had some fucking terrible teachers and i also had some teachers who ought to be in prison.
That's not to say they were all shite just the majority.If you're going into teaching ,good luck.