The US Government killing Snowden would be political suicide and only give the anti-surveillance movement teeth. (I'm not even sure that there is even a "movement" right now, but it would certainly become one if this were to happen.)
Ron and Rand Paul are just milking the NSA situation for all it's worth right now.
When you've been warning the public about the government's overreaching spying programs for decades and a leak of this magnitude happens I think it's appropriate to milk it a bit.
How many American people does the USA kill a day/month/year?
Drone attacks happen in the US too, but I think kills using the electric chair also count. I believe that these figures reveal the face behind the mask of the friendly Government.
Ron and Rand Paul are just milking the NSA situation for all it's worth right now.