Do you actually think the entire market could collapse the way Karp suggests?

No. That is the most extreme version of his argument and it took him about 12 minutes to get there, then one minute at the end to walk it back to the more reasonable point, which is that we cannot let China get ahead on AI. If you genuinely believed what he was saying in the first 12 minutes, you would not buy any stock at all. The fact that he is telling you to buy Palanteer in the same breath tells you that the doom scenario is marketing, not his actual belief.