None of the Riri stuff makes any sense, it's just an elaborate MacGuffin, to move the story and to introduce Riri for future stories. Knowledge and information cannot be put back in the box. Regardless if Namor and Wakanda were upset about her making vibranium detection technology, she already made it. It was already being used. The technology was released, developed and implemented. You really think just one device was made, put to use on that ship and all records of it within the US and/French governments was, what, erased?Kidnapping and killing Riri makes zero difference. Not only that, the Wakandans are risking direct war with the United States by operating within US sovereign territory and kidnapping a US citizen. And no matter what some characters in these films like to say, and I know it's just fantasy talk, but Wakanda would be insane to risk a direct conflict with the US and it's massive resources. Germany was once more technologically advanced than the US as well, but it didn't save them in the end, and the size and resources available to the US when it switches to wartime needs are overwhelming, there ain't enough vibranium in the world to overcome that.