The thing is, actual SC Residents ( aka Voters ) don't think they have a problem . They have easy Shall Issue .
No State based 2A Org has taken the banner up for visitors with enough fervor to counter act the political influence of SLED .
( And South Carolinians probably feel about the same about Atlanta residents , as Pennsylvanians feel about NYC residents .)
They have been working on constitutional carry the last few years. But you're right that SLED has a lot of political power and opposes any expansion of reciprocity because some "bad guy" might get a permit in another state and cause mayhem in SC.