> These deaths could have been prevented if all the students were not concentrated into these schools.

Dr. Peter Bryce's report is essential to understand the preventable deaths from disease: https://archive.org/details/bryceonresidentialschools/Bryce%...

The Indian Department knew that the schools served as a conduit for the spread of disease from at least 1907 onward. Dr. Bryce was still campaigning to get them to address the issue in the 1920s.