My conspiracy brain. Some of the people that might have literally pulled the trigger were so rich and powerful that the UN, etc dismissed any mention of sniper tourists as ridiculous tabloid-level rumor even though there were clear grounds to investigate.

I recall a video Bad Empanada did that talked primarily about Gaza but brought up the Bosnian genocide; he mentioned that Clinton knew there was a genocide for years, but the French government at the time wanted it to continue because they viewed a muslim country in Europe as an abomination. It stands to reason the UN dismissed it because the victims were muslim and they didn’t care, or simply didn’t see the perpetrators as criminals, or even that since the perpetrators were other Westerners that it looked bad and so decided to be quiet about it.