You don't have to shut down the labs. Understanding how it happened in the first place can inform effective policies to prevent future lab leaks. The Obama administration temporarily suspended Gain of Function research in the US in 2014 to investigate and mitigate lab leak risks. They did not dismiss lab leak concerns and characterize them as xenophobic attacks on the country.
Frankly, any solution that does not in some way involve "how can we prevent or reduce the incidence of this kind of problem happening" is political nonsense to me. Even with the most effective defensive protocols, a pandemic-grade virus costs a staggering amount of resources to deal with.