Well, there's always leftist Robin Cook's view on interfering with sovereign nations:

We recognise globalisation demands a New Internationalism.

And our internationalism recognises that we cannot deliver our domestic programme working alone in the world.

Our internationalism recognises that the boundaries of national interest have shifted.

As Kofi Annan said to the United Nations 'in the global era, the collective interest is the national interest'.

Our internationalism recognises that rights belong to the people not to their governments.

We ignored Milosevic when he tried to tell us that atrocities were an internal matter. Gross breaches of humanitarian law are the business of all humanity.

Again, I would like to see a case made that it would have been more "moral" to leave Iraq under Saddam's rule for the next four decades than to free the country. I touched on this in some detail here, in my responses to 1) and 3).