On Tuesday, someone posted a video on social platform X of a procession of crosses, with a caption reading, “Each cross represents a white farmer who was murdered in South Africa.” Elon Musk, South African by birth, shared the post, greatly expanding its visibility. The accusation of genocide being carried out against white farmers is either a horrible moral stain or shameless alarmist disinformation, depending on whom you ask, which may be why another reader asked Grok, the artificial intelligence chatbot from the Musk-founded company xAI, to weigh…