Before we move forward against ISIL in Iraq, we have to learn from our past mistakes, or we will be doomed to repeat them.
So here we are again. Parliament has voted to back military intervention in Iraq. In fact it is not so much as here we go again, as back to business as usual. Since 1990 we have been militarily involved in the country every year apart from 2012 and 2013. That in itself should give us pause for thought.
It's certainly the case that the most recent Iraq war has left a deep scar on British politics. Cameron is clearly all too aware of that with his statement that we should not let the mistakes of the past affect decisions about the future.
But the mistakes of the past are much broader than the "dodgy dossier". What the rise of ISIL shows is that the implementation of our entire defence strategy has been mistaken. The stated aims have been to tackle instability, identify security risks, to exploit influence to manage risks, to help resolve conflicts and strengthen international norms.
Does giving ISIL what it wants with a scrap in their own back yard achieve any of this? Plainly, no. US and UK strikes pave the way to further undermining the territorial integrity of Iraq, the precise opposite of the motion agreed.