Moody
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Most regulators, either by recommendation or mandate, require a check of landing performance before making an approach to assess the safety of landing.
In the event of an overrun accident where the flap setting does not give the lowest landing distance, then this outcome could be considered as not minimising risk because a better performance option was available.
If so, then any approach with a flap setting with a lesser performance than available could be identified as involving more risk.
Relating safety to risk / risk management, then irrespective of outcome, any approach with a lesser flap setting would be less safe, (i.e. not minimising risk where a lower option existed).
Also, note the subtle difference between
judging the risk in situational uncertainties vs
the choice of known advantages of flap setting.
Also a difference as to when the risk is assessed; before the approach (preference / favour of flap setting) or from the overrun area (regret).