The comment from @dukeyukey that you replied to says, as a reply to the suggestion we invest in peace rather than adverts:
> I'd argue the European Union was an experiment in peace along these lines, to bind a war-torn continent so close together that war becomes unthinkable.
I read that as more about bridge-building (and building the peace) than “peace keeping” in the “play nice or we shoot” sense that I get from NATO.
> In fact technically speaking neither NATO nor the EU have prevented wars happening in /Europe/ over the last 60-odd years. And I mean Europe. The EU is not Europe.
Okay, but why must the perfect be the enemy of the good? The context looks to me like “the EU is an attempt” not “the EU perfectly does this thing”.