The idiocracy of the UN

So me and my bro had a 3 minute little argument about the UN. Basically i think the UN was a good idea. It doesn't do much, has no military backing (muscle), and is ignored at the most crucial moments by just about everyone. Countries only use the UN when they need it, not when it needs them. The 5 power seats of the UN i think is stupid cause it means unequal sharing of power. Vetoes? come on.
Well what we were really discussing was the "failed" UN mission in Congo. 25,000 UN personnel there, and the general consensus is that they have failed to stop the massacres and killings. Why? Because of all the red tape and talk about sovereignty. The UN is worried about meddling in other countries afairs, but still is willing to send them to show a symbol. On several occasions UN armies have been reluctant to attack or defend because of rules and regulations. Why in the name of god would you stand there and watch civilians or others get attacked or killed and do nothing? Even if given the order to stand down, how could you in good conscious not do nothing. Could you live with yourself if you did nothing? Should you not stand up for those who do not have the capability to do so? I dont mean invade a country and occupy. But you should in good thought do something. My brother said that there are rules and sovereignty must be kept. He said that more people would have been killed if the UN hadn't been there. But if i were an army general there, and told to stand down. I would like to believe i would disobey orders, take the consiquences, and protect the people i have been sent to protect.