When context is the reason and when context is offensive to victims

When the US is a victim of an attack, the US adamantly refuses to consider the consequences of its foreign policies and wars.  After Sep. 11, American officials would bristle when someone would bring up the Palestinian question and underlying causes of Arab and Muslim antipathy to US.  But when Russia is a victim of an attack, only context is possible. Compare the treatment by media of the assassination of the Russian ambassador in Turkey with the treatment by media of the assassination of US ambassador in Libya.  US media would not even talk about how US had helped the fanatical Jihadis of Libya, who later killed the US ambassador.