Maybe humanitarian aid is one of the main pillars nowadays, it's not the reason why was created in the first place, shortly after WW2... It was created to act like a global checks and balances system in world affairs, so every country, no matter how small or ingignificant, had (a little) influence on world affairs, and not being buried under the force of over-ambitious and powerhungry world powers.
Well, unfortunately, it failed miserably, partly due to countries acting on their own - for example: why was there no new voting on a resolution the follow up 1441? Partly because the French would block it anyway, and also partly because it would only be held when the US secured a majority. Isn't that a bit odd: when the world says no, the US has to accept that, it's not almighty (well, on paper, I mean)... It's almost the same as keeping presidential elections as long as the desired outcome is achieved.....
And I agree there are double standards in politics anywhere: all I would like to see is that the US stopped it righteous act of being the great rescuer of the Iraqi people and would just admit why it so desperately wants its war (the whole world knows anyways, so why dodge the truth...?)