It's okay if you hate the UN and think it's useless or evil or should be destroyed. That's your choice. However, such opinions do not make you a suitable candidate for Ambassador to the U.N.
The U.N. exists and we are a member of it. The Bush administration would have more success in getting what it wants if it stopped extending the middle finger to everyone. Now, I'm not entirely sure I want the Bush administration to have success in getting what it wants - we don't always agree on what exactly is in America's interest - so maybe from my perspective this isn't such a bad thing.
But, you'd think the Bushies would have learned their lesson from Temper Tantrum Cellucci's recent experiences in Canada.