1. Gain of function research primarily uses samples collected from nature, and seeks to stimulate their evolution in as natural a way as possible to learn how viruses evolve in nature. If such viruses were to escape the lab, they would appear "natural"
2. It's not xenophobic for people from the US to suggest the possibility of a lab leak, because the US was itself funding gain of function research on novel coronaviruses in the Wuhan BSL4 lab
3. Lab leaks happen more often than most people realize[1]
[1]https://www.vox.com/future-perfect/2019/3/20/18260669/deadly...
Read the section in the WHO report on COVID19 and listen to the reputable international scientist that actually went and visited the lab and interviewed the people who worked there.
https://www.who.int/health-topics/coronavirus/origins-of-the...
As far as I know, the government may have tried, but the scientists themselves were not down with it.
This sort of culture of the openness of science is why the Chinese government distrusts scientists inherently. And also why Shi Zhengli has maintained an extremely consistent story with the pandemic despite the government's changing its story like 3 times. Also why they've since silenced her. They don't trust their own citizens, and definitely not their own scientists.