Our Govts, of all persuasions, entrust and outsource the country's security needs for all kinds of tasks eg jails, Manus Island, 150 (apparently?) guarding the Sri Lankan family of 4 on Christmas Is., Centelink and Medicare Offices, airports, defence bases, both land and ports. There was no real dereliction of duty on behalf of the Victorian Govt when the use of private security is common practice these days.
The real problem seems to be the sub contracting then further sub contracting involving 3 companies, which the original security firm let out with no supervision, training or accountability.