the US has a huge rate of VFR into IMC accidents
It might have a huge number, but I'm not sure about the compartive rate between Australia & the US. The US also has 15,000 ft plus mountains vs Australia which has a LSALT of 7,000 ft. The US has tornados, Australia has much more begnin weather. But the US has something approaching 50% of its pilots instrument rated. If I recall correctly, Australia is something like 15%.