Comanche, you will not be 'fired' for ANY of the things you mention in your post.
If that was the case, we clearly wouldn't have any pilots left! You may well be fired for landing deep from a VERY unstable approach instead of going around, but then why should any company be kind to folks who blatantly put peoples lives at risk by doing crap that is dangerous?
There was a lot of knee-jerking after the MEL incident (which IMHO was a crass cock-up, clearly not following SOPs, and ignoring Airmanship -- Flex 74c on a 14 hour flight???? Come on guys!!), and I agree that the MAN guys - especially the F/O under training should not have been fired, the ACC guys were subsequently re-instated.
Basically, if you go to work, do your job professionally, stick to the rules, exercise good judgement and airmanship, stay 'above the line', and keep your head down, you will be left well alone - as in any airline... If you go to work, don't follow procedures/rules, and make a stupid error nearly killing 300 people, then good luck to you, you are now on your own!! - as in any airline!!
We all make mistakes (yes including me), none of us can say we have ever achieved a 'perfect' flight, yet we're still employed!! Why is that?
Hope this clears things up for you?