legislative creep.
Hawk hit the nail on the head by bringing up the fact that people go to jail to pay their debt to society and _should be_ released when that debt is paid in full. In reality, that does not happen any more. The problem with this is that as a result of our kinder, gentler treatment of prisoners, all of us - the law abiding - are made to suffer the background checks, with all the baggage that this carries. Putting aside the philosophical, never to be answered discussion of whether or not "Felons with guns" is a good or bad idea, consider this.
As a matter of principle, conceding that background checks are "OK" with gun owners essentially gives the other side a building block to use against us. It enables them to make more and more prohibited behavior 'flag' the person 'applying' as "of ill repute" to use a phrase from above...
Right now, all that is required to "disable" a gun owner is a restraining order in some states. As seen here on THR, SC is using a person's speeding convictions to deny him his CHP. Whether you agree or not, these concessions to the Permit system for shall issue, NICS instead of waiting periods have had equal and opposite reactions.
I also think that as a matter of principle, NICS should be chipped away at as we have had restriction after restriction put upon us. Continuing to push for NICS exemptions for permit holders is one example. The more ground we compromise, the less ground we have left to defend.