I believe the reason why a non-Christian may struggle is because there is an imbalance in the Nation in which they live between the 'good' and the 'bad.' When the imbalance is there, a person cannot see which is better for them to choose. When a Nation is 'righteous' then a person may cling to that righteousness since the righteousness will produce many prosperous results but when there is an overabundance of 'unrighteousness' a person cannot see the prosperous results and so will have a difficult time in saying if 1-it is good, or 2- if it is bad. When a Nation is balanced, per se, then those that desire prosperity will run to prosperity and those that desire 'unrighteousness' will run to 'unrighteousness.' But the opportunities for both will be there for any individual to choose from which will set a person's mind and soul at more peace in their pursuit of their own desire thus not causing too many struggles of emotions and thoughts.