Journalists are people, as are aircrew, groundcrew, junior officers, flag-rank officers, politicians, defense executives, butchers, bakers...
There is a really strange thing about people. They are all different.
Measure any characteristic (competence, ethics) and you'll find a bell curve for everyone.
Some journos are excellent at what they do, some continue to strive to do things at which they frankly suck. Some are ruthlessly impartial to the point of dullness, some are prejudiced and some simply have strong opinions based on experience.
The result is that there is only one generalization that is always accurate, as water is wet and sparks fly upwards, and that is the following:
Any statement that begins "All journalists [fighter pilots, air marshals, stamp collectors...] are..." is wrong.
That is all.