Since China is control of the evidence (lab), there will never be indisputable evidence in your mind. However, if you add up all of the other valid evidence- the defector (have you read that first hand report?), intelligence reports, scientific papers from the WIV scientists, the design of the virus, the behavior of China (frontrunning PCR tests, protective gear, obfuscating the investigation), and so much more, it becomes abundantly clear that the virus was manipulated by the Chinese (with monetary support from the US).