There's around 8 billion people on Earth. Most of the wealth on Earth is controlled by a small number of those people. What stops the other people from taking it from them? Answer: The illusion of power and control, via use of that wealth.
Historically, the best way to control people is to divide them...over and over. That's what we're seeing nowadays: via use of the mass media. You'll rarely see a major news story nowadays that doesn't pit large groups of humans against one another. Currently, the best "division" strategy is for them to use the media to promote left-wing thought.
Since a lab-leak doesn't align with the political aspect of Covid, they're doing everything they can to squash any discussion of it. Admitting they were wrong, or having discussion around the possibility of them being wrong, would bring the possibility of people waking the fuck up to the level of bullshit they're being fed.