People that have or have had real trouble in their lives and have overcome it have a very laid back attitude towards the small stuff, and in general will have a 'live and let live' attitude.
People that have been fortunate in their lives to date to not have any major issues they've had to contend with are much more likely to display this kind of behaviour because on their 'trouble' scale it figures much larger relative to their 'end-of-scale' marker.
In times of the aftermath of an earthquake nobody cares about their chocolate not tasting right.