//Yes, it's probably best not to judge the parents who took him away from the best possible care he could receive. (?).//
Yes it's probably best not to judge Zacs. There is more to life (and death) than 'the best possible care' aimed at prolonging something which is inevitable. Maybe they wanted his death to be a more private and intimate affair to make it more bearable for them ( and him) rather than being stuck in a hospital bed waiting for the awful outcome that everyone knows is coming, with all and sundry around trying fruitlessly to make the most awful situation better.