Unlike some of the time-travel movies I love like 'Primer' or '12 Monkeys ' 'Looper' is not about time travel. It's about this situation that time travel creates and the people dealing with that situation. So narratively the big challenge was to have time travel get out of the way.
You know that big government doesn't hurt big corporations. They've got the best lawyers and accountants in the world. You know who gets destroyed by big government? It's the little guys.