Indeed. The lengths these False Causers go to is incredible.
The CSA leadership knew the USA leadership quite well. The CSA knew disHonest Abe was a radical and what his agenda was and leaving Sumter in the hands of the yankees would have effectively closed off the port.
The bottom line is, the CSA had just as much claims on federal installations as the north did, even more so since we paid for them.
The fort was unmanned and unfinished until it became of interest in 1860.