Certainly no one wants to live in a police state with a bar code on our forehead.
However,instances like this show that the system worked because it stopped someone who obviously thinks paedophilia is acceptable from having access to Australia.
Who knows what this clown did when he was on trips to Australia.There has to be a level of detection and enforcement involved and the amount or degree of what is needed is the $64 question but it worked in this case.