Well for starters, that is my opinion.
I cannot see how anyone could think otherwise.
I did not (I hope) ever say that Jetstar WAS unsafe, just that it is LESS safe than Qantas or Virgin Blue. (I am not going to say the other Majors again).
For the last 50 years or so, we have always had a system where most Aircraft of the Main Airlines have routinely at most Airports had BOTH an LAME and one of the Pilots carry out independent preflight checks.
Now this MUST be safer, okay more costly, but SAFER.
Three independent checks would be even safer, and four safer still, etc etc.
Virgin Blue tried it with no LAME, but have since reversed the decision, partly due to pressure for the ALAEA, but also they were caught out on spot checks by CASA Inspectors.
I am sure that sometimes even an LAME may miss something, and I know Pilots have sometimes as I have been involved in some such incidents, but am reluctant to post details here of course.
That is why it is SAFER, but more EXPENSIVE, to have both the Pilot and an LAME check each Aircraft.
Jetstar are currently the ONLY Main Airline that refuses to do this, ergo they are LESS safe than Qantas or Virgin Blue.