Cost possibly if a baby sitter was required? On the other hand, hasn't it been said that getting three sleeping children from the crèche above OC main reception the several hundred metres back to the apartment would have been a bit of an ordeal every night and especially so if the parents were tired and slightly intoxicated?
Remembering that they didn't go back to the Millennium Restaurant because it was felt that it too was just a tad too far to have to go with three young ones in tow each morning. If I'm honest I wouldn't blame them since when you go on holiday with young children you expect the facilities to be on hand and not hundreds of metres away.
The spread out nature of the accommodation in Praia Da Luz did give it particular problems.
If a risk assessment had been carried out for apartment 5a, I am sure the deficiencies of the accommodation would have stuck out like a sore thumb.
(a) the isolated front door
(b) the high, overhanging trees at the front giving plenty of cover
(c) poor lighting, exacerbated at one time by a broken security light.
(d) easy public access to the property from the main road front, side and the lane at the back
(e) patio doors which did not lock from the outside
(f) insecurity of front door keys
I wonder how aware the holiday party were that not all the accommodation around them was part of a holiday complex but private residences? A non sequitur perhaps, but not realising the open nature of the apartments might have been a contributory factor to them lowering their guard.