Not quite correct about US airports.Los Angeles International Airports own and control LAX and VNY for example. Both very expensive place to operate from especially land and building rentals.
Los Angeles World Airports (LAWA) is the City of Los Angeles department that owns and operates Los Angeles International (LAX) and Van Nuys (VNY) general aviation airports. Both play an integral role in helping to meet the Southern California regional demand for passenger, cargo and general aviation service. Both airports make a distinct contribution to the strength of the system as it provides a high level of safety, security and service for its customers, communities and stakeholders.
Many airports fit this category.
Burbank installed the RESA trap after the last incident when a WN B737 overran the runway and into the fence etc.
Why Australia doesn't do this I don't know.