It can be a very confronting topic. I hope the following may be of interest from an historic perspective.
Breaker Morant was born in England, and migrated to the British Colonies that became Australia. He married Daisy Bates, in Queensland in 1884. The marriage failed. The six British Colonies were federated into one British Colony, Australia in 1901. 'Breaker' refers to his skills breaking in horses in regional New South Wales and Queensland. My Great Grandfather and the family knew him out in the far western districts of NSW in the late 1880s and early 1890s.
Various Australian colonies sent volunteers to South Africa to support the British military during the Boer Wars.
Queen Victoria had signed off on the Australian constitution in July 1900.
Breaker Morant served in the Military in South Africa during the Boer War, and faced a court martial under the British Army regulations. He was found guilty and shot at dawn.
The newly formed government of Australia made its own laws and in 1903, as a direct consequence to the population’s reaction to the shooting at dawn of Breaker and one other, they passed laws that in effect banned the military courts from order the shooting dead of Australian military personnel at dawn or at any other time; and so, during WWI no members of the Australian Imperial Force were subject to such action.
Then in the 1930s the Statute of Westminster and gave further independence to Britain's colonies, particularly to the ones known, by then, as Dominions. But the Dominion parliaments needed to formally legislate to adopt that Statute. So, Australia chose not to. It had entered WWI automatically as a colony of Britain. WWII, again automatically at war, as the Statute of Westminster was not yet adopted.
Then it was discovered that Britain had proceedings to court martial two Australian navy chaps... and the charges had the penalty for death. (the Royal Australian Navy completed its formal separation from the RN as recently as the 1960s but that's another history story) So, Australia rushed through laws adopting the Statute of Westminster and backdating their commencement date to 3 September 1939, to in effect stop the courts from imposing the shoot at dawn prospects. It is not often that retrospective legislation actually becomes law in Australia.
Here's so websites that will likely have a much better way with words than me. Daisy Bates would likely be an interesting person to study too.
https://www.awm.gov.au/visit/exhibitions/fiftyaustralians/33 https://www.awm.gov.au/articles/encyclopedia/desertion https://www.themonthly.com.au/issue/2007/june/1290560118/shane-maloney/daisy-bates-harry-breaker-morant https://www.awm.gov.au/collection/P10676773 https://en.wikipedia.org/wiki/Statute_of_Westminster_Adoption_Act_1942 JM