Excuuuuuuse me...but where have they ever "kept" the peace?
A paper bag would overwhelm the UN's ability to respond. After listening to them, would anyone really want them to? Where does their "demand" come from? It's not like monetary demand, where people want to but their services. It's not like democratic demand, where people will vote for it. Their "voting constituency" consists of a majority of non-democratic states. So how does one empirically assess if the demand is too high, or if in fact the supply of UN-hokey is way-too excessive?
Well, being in a democratic republic, I help to decide that by voting with the guys who agree with MY assessment: The UN shouldn't even try to keep the peace. When the peaceful initial debates are over (at the UN), then it's time for bigger players to deal with the breakdown in diplomacy and time for the UN to stand down and try to stay out of the way. The UN is a glorified debating forum in a big wide world after all.