Is the United Nations just a front for western imperialism?

Seven years later yet another invasion. The hated George Bush has been replaced with peace activist Barrack Obama, the lying Tony Blair has been replaced by the truth telling Cameron and Monsieur Sarkosy another little strutting French man imagines himself in the role of a latter day Napoleon. All of these knights in shining armour proclaim their love for the Libyan people and their concern about their welfare. Oil ? What oil? Nah!! We are humanitarians. We send in our death machines not to kill people from the safe height of five miles up in the sky we kill people to defend their liberty their equality their fraternity. etc. Anyway, its not our fault. We have a UN mandate for our actions. Blame the UN therefore. Agree disagree ?