This reminds me so very much of a quote from Jingo (yes, by Terry Pratchett):"Love is like war, easy to start and difficult to stop."
"The problem with mercenaries is that they need to be paid to start fighting, and unless you are very lucky, you end up paying them even more to stop."
And also:
Stopping a battle is much harder than starting it. Starting it only requires you to shout ‘Attack!’ but when you want to stop it, everyone is busy. (Monstrous Regiment)
Oh, what the heck - one more:
'Putting up a statue to someone who tried to stop a war is not very, um, statuesque. Of course, if you had butchered five hundred of your own men out of arrogant carelessness, we’d be melting the bronze already.'
(Jingo)
I'm sorry. But Terry is endlessly quotable.