If america can't lose 4 americans, you should really stay home and stop bothering people. Pull out of every country. Stay home. Let China rule the world. They won't sweat 4 people. Or 4000. Or 4000000.
Complete bullshit. There is acceptable risk, such as the risk that some radical Islamist assholes will kill you. What is unacceptable is your own government leaving you to die unnecessarily at the hands of those radical Islamist assholes.
Make no mistake about it. We had more than enough assets in the area to defeat the attack and rescue our consulate personnel. There was a conscious decision not to do so. That decision could have made only at the very top.