[Thomashuet]

As Wikipedia puts it: Most registrants in the U.S. have registered for .com, .net, .org and other gTLDs, instead of .us, which has primarily been used by state and local governments, even though private entities may also register .us domains.

This makes .us a prime target for attackers because victims tend to trust .us more than .com. Nothing GoDaddy can do will change that.