Nothing in aviation safety should be taken as black and white, except perhaps the finality of life.
Safety is not without risk; identify and manage risks to maintain an acceptable level.
Manage those aspects which are within your power; to the best of your ability.
The above requires judgement.
Judgement comes with experience.
Experience comes with practice and time.
Make sure that your time does not come too soon.
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when you climb a ladder and something is out of reach, there are two things you can do: stretch out to reach it or climb down and move the ladder. "Ten years ago I stretched out; today I move the ladder. I've learnt it's worth the effort." After Hollnagel.
The ETTO Principle.
Fostering successes rather than reducing failures.