Coronavirus as a bioweapon vs basic logic

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I've seen people talk about how Coronavirus comes from the same city as a top security virology lab and how it must be a bioweapon. While its plausible that it escaped and is being covered up, wouldn't it be a really shitty bioweapon? It has a 3% fatality rate.
If I was in charge of making a deadly virus and it only killed 3% of infected I would be very disappointed in myself.