Imagine if that didn't exist? Biden visits Qatar and gets arrested for dis-respecting their leaders? I can see that all working out.
The truth is, I doubt there would be much decent evidence that would hold up in Court. It's like Russians being murdered outside of Russia, "of course" Putin would have had to order it but "of course" wouldn't cut it in Court.
I do not have a problem with that. If you want to be part of the civilized world, you have to act civilized. And if Qatar wants to arrest Biden for disrespect, then either Qatar’s leaders will find out what the US spends its military funds on, or US taxpayers will find out how much of a waste all those aircraft carriers were.
https://www.bbc.com/news/world-us-canada-46676200
I do not see how the people of the USA benefit from this arrangement.
Because you're shortsighted in your hatred for MBS. MBS can be deposed and hung in a public square (along with the entire royal family) for all I care, but that doesn't mean immunity isn't an important diplomatic tool.