USA has the highest incarceration rate. Why?

[Laurel Aitken]

Level1Death said:

RolStoppable said:
You have too many guns.

This. Plus we commit the most crimes.            

http://www.nationmaster.com/graph/cri_tot_cri-crime-total-crimes

That's not true. The OP has a graphic of incarceration per capita, your statistics show total crimes (not per capita), USA is one of the most populated countries, therefore, it obviously will have a high total crime rate. I think this statistics are better (crimes per capita). In there USA is #8