If I thought that the UN would fold up it's tent & just go home if the US pulled out, I'd agree. I think they need a babysitter.
My post wasn't calling for a pullout from the UN (though I don't think that would necessarily be a bad idea, either, since they're heavily dependent on us). What I said is that we shouldn't be encouraging it to be more powerful (or "effective" or whatever buzzword the administration wants to use). As long as we stay in, we should be inhibiting it at every opportunity.