Do you really believe that fewer than 300 murders occurred during this time?
The FBI maintains murder statistics for most policing jurisdictions in the US. Many of them are under 2 per 100,000 per year: Sunnyvale, CA; Hercules, CA; Novato, CA, Brookline, MA; the Twin Cities. The rate in Beverly, MA, is 0.946.
Japan's rate is 0.4.
The population reached ~300k in 1750. A murder rate of 2 per 100k times 300k people equals 6 murders. Multiply that by 50 years to get 300 murders.
This doesn't affect my 2nd and 3rd paragraphs though.
It was a violent time.
Just one 'dataset': https://en.wikipedia.org/wiki/List_of_Indian_massacres_in_No...