Exactly the same reasons as a c/s Caro.

My last client had a midwife come in and say, 'Well it's been xxx hours now since the waters were broken and there have been no contractions, you have to think about you now, you will be exhausted if you keep going and you go into labour overnight. You have to remember that labour is on average 12 hours. So you could be going all night..'

Well a) don't most people go into labour overnight anyway and
b) if she wasn't actually in labour then it was like any other day for her - not like she was labouring at the time - she could have slept, kept trying to get labour going... but nope... there is this thing the medical system have called 'failure to wait' not 'failure to progress'.... see how it all gets put on the mother and she feels like her body failed? She has a crap experience and thinks its her body that couldn't get into labour? And as a result has that drip and all the rest happened with it - she had the epi and the c/s. Or she now thinks that thank god I was in hospital, I needed all that intervention when it all could have been avoided. Sure could have gone that way anyway - but also could have been completely different too if left alone.