> Ellipsis, we have no evidence that warfare was part of all past mass migration events.
The point is that historic mass migration events, and the success or otherwise of them (especially from the point of view of the host society), are no indication of future migration success. The world has changed, the means of migration have changed, the reasons for migration have changed and the relative strengths of the migrants and host societies have changed.
> I am interested in the opinions of others as to which UK needs caused the UK to rush to Afghanistan and Iraq (let's limit it to those two)
Political posturing, mostly. There remains the great (IMO unanswered) question of WMD.
> when did the EU force the UK into that
They didn't.