I wonder if [they] were screwing around with the chickenpox vaccine and somehow came out with a weaponized version after infecting primates?

With what we know about SARS-Cov2, it's not so farfetched.

Edit:

I meant smallpox, not chickenpox.

I wonder if [they] were screwing around with the chickenpox vaccine and somehow came out with a weaponized version after infecting primates?

With what we know about SARS-Cov2, it's not so farfetched.