You are assuming a lot here. The USA also procecutes victims for not running away fast enough and causing harm to their attackers. There is a history of people in your country as well who have been charged after defending themselves from a violent assault / rape / murder attempt even in states with more protected self defense clauses
( non exhaustive examples : https://www.nytimes.com/2017/02/07/us/marissa-alexander-released-stand-your-ground.html
https://www.newyorker.com/magazine/2020/01/20/how-far-can-abused-women-go-to-protect-themselves)
So I posit that your concept of how law works in the case of self defense is a lot more similar between our two countries than you think. The difference lies in how much power and authority we grant police as a society. Here becoming a cop is either a 2 year standardized college course or a 6 month intensive boot camp for RCMP hopefuls as a primer and then an apprenticeship cadet program working under a seasoned officer. The techniques taught as absolute basic are soft skills, psychology, critical thinking, legal knowledge as well as self defense and weapon skills. While they are granted some extra authority over a regular citizen for the most part their rights are the exact same as any regular citizen in terms of how excessive force works.
Your citizenry's permissiveness in wild west style police justice kills people needlessly. It's the people's expectations as a whole that grant them the sort of powers of an occupying military force. The entire model of policing is needlessly dangerous and values following orders more than people's welfare.