If I were running in Australia I’d be a lot more concerned about the crocs, snakes, spiders, and other critters that can fell you quicker than you could say G’day than any human assailant.
The injury rate for runners ranges between 50-100% per year per runner depending on the metrics. Injury includes fatal and near fatal injuries as well as over use injuries leading to chronic disabling conditions.
Running is a stupid form of exercise if it is health concerns that motivate it.
Cardio benefits are marginal at best, injuries are certain at best.