Point taken, but there is a little more to it than that. As I understand it, commonwealth laws tend to lean more towards the old (British and early Colony) common laws. Again, as I understand it, that is less applied to criminal law and more to civil law. But there can be applications of common law in both. A lawyer could no doubt explain it better. The last time I heard a lawyer talk about it was over 20 years ago.
None if the above should be construed as agreement with eliminating protections for police. Saying it is part of the job is what we tell each other privately when we suggest they were close to (or did) go too far or react too quickly.
But to attempt to codify that would be like absolving electrical companies from civil suits because the electricians knew they were in a dangerous job. That regardless of any lack of good safety features by the companies to mitigate as much danger as possible. Any judge who thinks police shouldn't receive at least as much protection as any other citizen has flawed reasoning in my opinion.