1) LOL!
2) Palmetto and Crescent are the symbols of the South Carolina flag, the crescent going back to the War of Independence and also featured on the Confederate flag.
http://en.wikipedia.org/wiki/Flag_of_South_Carolina
3)Even if this were a Muslim thingie... they can have license plates as they please to the same extent as anyone else. Putting their symbols on their plates is not any different from Christian or other messages, symbols on plates. But that’s obviously not even the case here.
4)Have you even bothered checking the South Carolina flag?
4) No. South Carolina is not my state. I do not even know what my state flag looks like, nor do I care.