To be candid and in my own opinion, people who are radicalised and not integrated into the society from history are those who either came here on boat or in general as refugee. We that spent money following the right channel (s) either studying or working visa(s) or even Skill migration are well screened before granted visa(s). Let's take the Melbourne recent terrorist case as an example, the guy came here when he was young, so as he not well integrated into the society? So the problem is not how long you are here to integrate but the willingness to integrate into the society, and most people who came here freely and hooked up public funds on arrival seems to be those who never appreciate what this beloved Country did for them and not we that contributed to the growth and development of the Country.