War

War
From the Somme to Syria and beyond, war has been or involved acts of folly and ignorance.
War in general may be characterised for society:
For democracy it is always an evil but sometimes a necessary evil, justified, or simply virtuous by intent.
For anarchism it is an act of self-defence.
For tyranny war is a continuation of diplomacy by other means.
When it exceeds its purpose and exceeds all control it is act of chaos that destroys all society.
A democracy that is implicitly altruistic to a degree, needs to protect itself from anarchism, and it must oppose tyranny, while avoiding mutual destruction and chaos.
Pragmatism may rule over the desire for virtue.
If a union of nations is democratic then it cannot, other than through impotence, set a rule against enforced regime change. To do so perpetuates tyranny, as might be envisaged if WW2 had baulked at removing Hitler and the Nazis.
It is a matter of factual debate. But the main folly of B and B was not that of removing a tyrant from Iraq, but in demolishing effective state and police control pending a long period of democratisation.