Comment by defrost

It was common enough at the time to hold the opinion that "mixing of the races" resulted in offspring that were worse than either race.

Frequently expressed across the colonial Commonwealth, Canada to Australia, South Africa and elsewhere.

eg Daisy Bates (sometime wife of Breaker Morant) wrote in the state newspaper in regard of Australian Aborigines:

  Aboriginal civil-rights leader, William Harris, wrote an article in response and said bi-racial Aboriginal people could be of value to Australian society. Bates replied, "as to the half-castes, however early they may be taken and trained, with very few exceptions, the only good half-caste is a dead one."

Miscegenation Laws regarding mixing of races remained in force in Bates part of the world until the 1960s, as did others enforcing the separation of mixed children from their families.

It seems less "a solution to racism" and more an excuse to enforce racist ideas aand attitudes.