Why blaming Wuhan lab leak is "nationalistic" or "caricature". China is a communistic country, it cannot care less about anything besides standard communistic agenda, gathering more power, winning more influence, spreading "revolution". Was crashing freedom in Hong Kong necessary? Is Urguys and Christians persecution needed? Did they care that their rocket debris might fall of the sky on some large India city and kill 5 million people? Do they care about factories that dump wastes directly to rivers and thanks to that they are cheap? And so on.

There is a great book by Kissinger about China that explains a way of thinking Chinese rulers have. That was stroked me most was a chapter about early conflict between US and China (in Mao times). US were trying to frighten Chinese rulers with nuclear weapon, but Chinese answer was that even if US strike them that way and kill 300 million people, there is still 700 millions alive.

If you look on Covid from that perspective, the mess in some lab in Wuhan sounds very plausible. For Europe/US it is a big problem, for China it is a big opportunity.

In Europe/US there is a lot of regulation concerning research (ethical, security) that just don't exist in China. We don't know what they do in terms of genetic modifications, cloning, bacteriology, etc. The fun fact is that western companies are eagerly investing in such research in China as they are cheaper and they don't need to care about boring stuff like ethics.

We should be scared.