I think its interesting that your two examples of 'uninitentional' eradication both have demonstratively been used intentionally to do just that.

Smallpox US: https://daily.jstor.org/how-commonly-was-smallpox-used-as-a-...

Smallpox(Or Other) in Australia: https://www.abc.net.au/radionational/programs/ockhamsrazor/w...

CIA and Crack. https://oig.justice.gov/sites/default/files/archive/special/...

Australian Colonialists paid Indigenous workers with alcohol and tobacco. https://cspm.csyw.qld.gov.au/practice-kits/alcohol-and-other...