99% of the time it was due to tiredness.
Just playing devils advocate here.
Why were you tired? Did you not get sufficient rest before your tour of duty? If you're so tired that you 'require' the ILS then how would you have dealt with a non normal or an emergency? Should you have been there in the first place?
It's been a fascinating discussion to watch but the nuance lacking in some of the 'point scoring' has been interesting. If you 'require' the long runway then go for it. Sometimes that requirement demonstrates a highly professional and competent decision. On other occasions that requirement may be the complete opposite. The reality is that none of us not on the flight deck will know which one it is that day. That won't stop us passing judgement though!