I'd attribute it to the fact that we have a tourist base of 14 MILLION people per year and a year round population of about 50,000, in the Myrtle Beach area. I think Horry County has about 225,000 total.
The numbers are set to be skewed from the start, just as they are in Vegas, Orlando, and other MAJOR tourist areas/destinations. Of course, as with any tourist destination, the transient population doesn't help the crime stats..