Sunfish
While I can see what you are saying, I don't think its as simple as you crashed therefore you must have done something wrong.
As far as the UK is concerned,, then there would have to be more evidence than a 'crash for no reason' to justify a conviction. Most UK legislation would cover anyone, not just aircrew. For example Endangering the safety of an aircraft, is an offence that can be committed by any doing something, or ommitting to do something which led to an aircraft being put in danger.
The test is not one of human error, its a test related to what an avarge, or reasonable person having that qualification would or should have done.
That test would apply to every occupation or activity, aircrew are not being singled out for any underhand treatment.