Agronomically: NH3 forces the user to apply it properly...in a band and at depth.  It tends to show an advantage over other N forms but if you look at the details, I think most of the advantage is because the ammonia is usually the only thing tested which is applied properly.  Spreading N on top is NOT the correct way to apply N, regardless of form.

Economically: NH3 is the best deal.  Everything else is made from it, so if something else is cheaper it's an anomaly.  

Safety:  NH3 does require proper handling and training.  

Transportation:   NH3 requires handling less tonnage then any other N source. 

Criminal Justice:  I'm not sure I understand how this is a farm problem.  

Environmental:  Ammonia is less likely to be lost then any other form of N, assuming application methods which are the norm.  

Manufacturing:  NH3 is the source of N regardless of what commercial N form you use.  Other forms require further, unnecessary manufacturing processes. 

Energy:  See manufacturing and transportation replies above.