I have wondered this too @NSamuelle, but was not sure how to express it without sounding crass. So thank you for opening this door so gently. I have considered, like you, that JG/EC may have been driven to hike their last 2 miles up SLT in a desperate attempt to get back to the truck and home to 'make all this right again - get Miju and Oski back to safety.' Their motivation, perhaps understandably, could have been to avoid being discovered with two critically ailing dependents by LE or SARS. IMO, they may have thought if they retreated to the river to get / stay cool and wait for rescue or much cooler temperatures overnight, then they might face allegations as you describe. And that alone might have scared them into their demise. It might not have required a nefarious character to scare them to death.
All IMO.
BBM...
Boy, William of Ockham might have something to say about this!
