two possible things are going on here:
1. they want the law to specifically name President Obama, the FBI, the CIA, the DOD, the NSA, etc etc..and specifically says that they have no authority to arrest & indefinitely detain any legal resident of the USA without charge or trial. Such a request is kinda silly.
2. they are conspiracy theorists, and believe that regardless of what the law says or how it is amended, Obama and the DOD or whomever else will use it or abuse it to detain indefinitely anyone in the USA, without charge or trial. This goes for suspected terrorists, Teabaggers, OWSers, or anyone else that has a view that slightly oppose the govt.
personally, I believe most of what we are seeing here is #2, and you can't argue with such paranoia.