The case isn't that it was an intentional leak, it's that it was accidental. Incompetence, not malice as is usually the explanation for most things, from this to Chernobyl and on through history. There have been multiple close call accidents at all these labs across the world, that's why it's so important the international community addresses this problem. It's taken on an extra importance now because of the proliferation of research that purposefully manipulates natural viruses to make them more infectious to humans.
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