I'm also down to make a clean break with the UN, but I'm pretty sure we need a reason to do it, legally speaking. I'm not sure of the legal standards applying to treaties, but to simply leave without stating a reason would likely be viewed as "arbitrary and capricious" by a court, giving the court a reason to nullify our withdrawal.

On the other hand, this situation provides perfect cover to withdraw if we so choose. I agree with you that the situation highlights the corruption and waste of tax dollar that is the UN. I have felt that the UN is a waste of time for quite a while and I know others who have as well. That is not the fault of the Trump administration, and weeding out former corruption can only make America look stronger and better in the eyes of its (reasonable) citizens.