Neville,
I think it comes down to this.
There are the pilots who are in Qantas, some of which have seen the career path they thought they would have when they joined disappear due to the direction QF Management has taken the Group. A very small number of them will come on here and comment that it is the destruction of QF, and probably believe they should be the CEO.
Then there are the pilots who aren't in QF, but tried to get in. A very small number of them will have a heavy chip on the shoulder about not being selected, so they will come on here and cry the downfall of QF because they need it to fail to feel better about themselves, and prove Qantas was wrong (in not employing them.) It's completely irrational - very good people get missed in every field, that is life unfortunately - but a path some follow.
It's also an anonymous board where people just come on to stir the pot.