I would argue that the Western world largely didn't care, but the journalistic class which controls a large chunk of what people think is happening had a tantrum. This was not a "look at what Trump did this week" tantrum, but rather a "these guys just killed one of us, YOU HAVE TO CARE" tantrum.
You can tell it's this because the journalists themselves don't really care that he died trying to expose what is happening in Yemen - they only care that a fellow journalist died a fairly gruesome death.
Expecting the press to be objective or reasonable where their own prerogatives and interests are concerned is foolish.
Yemen is the poorest country in that part of the world and poses no threat to SA.
The only reason the US aides SA in bombing and starving Yemen is they asked.
As an example look at Botswana. They are moderately well-off only because of low corruption and strong internal organization even though their neighbors are incredibly corrupt and have frequent political/military turmoil.
You also seem to be implying that African and Latin American people are just naturally more corrupt than the inhabitants of other nations which is a kinda bizarre theory.
Silicon Valley should have made a public statement a long time ago about what MBS is doing to Yemen. It's quite ridiculous that being directly responsible for the deaths of thousands is A-OK, but ohhh kill one journalist and the western world loses their shit.