The question Elon Musk lands on is whether people like that should be let into the country at all. The person he's describing had worked at the Tesla factory in Austin until December of the previous year, got fired after a violent assault on a woman who stepped on his prayer rug there, and months later killed three students in a downtown Austin bar. The framing isn't a random mental health episode, it's a belief system that ranks its own rules over everyone else's rights and meets any perceived slight with violence. His wording: "Now I don't think we should allow people like that into the country. Do you?"