I fail to see how the UN harms us at all, since we sit on the Security Council and can veto anything.
Yeah, we can be bound by treaties made through it... but we are bound by treaties made by our heads of state anyways. No dodging that whether we are members or not.
I loved having Bolton there. It was great entertainment.
The only small danger I see is us giving money and time and attention to those that have ideas antithetical to our Government.