It's the same reason why politicians say nothing of substance anymore. In the olden days, the occasional slip-up would slide. These days if you say the wrong thing, you can spend weeks or months defending it, and it can even cost you your job.
It's not just a case of 'bureaucracy gone crazy', but also of 'we demand too much of them'. The stereotypical example is that teachers used to just teach, and now they need to be nurses and social workers as well.