The UN is a great example of why you can’t have democratic institutions where the constituents have fundamentally different values. Saudi was recently the head of the HRC: https://www.washingtonpost.com/news/wonk/wp/2015/09/28/why-o...
I can't honestly say either way if this human rights council is something we should be members of or not, but leaving sure makes for bad press.
You may not like it, but that's what the goal has always been.
The US withdrawing from the HRC basically says 'we do not care about human rights' to the world. As if the last couple of days of imagery from the Southern border would require any further explanation.
Similarly, voting against the PATRIOT Act basically says 'we do not care about patriotism' to the country.