Why... couldn't they be redeemable for dollars at will?

US Gov: North Korea hackers have the stablecoins at address _________
Issuer: oh hey thx for letting us know. anywayz we will convert them to dollars for anyone that asks
US Gov: K, welcome to jail, bytch, and give me all your money, ho
Issuer: wait but they moved them around from that address, how am i supposed to know
US Gov: welcome to jail, bytch, and give me all your money, ho
Issuer: wait, we'll prevent redeemability from anything related to that address, broadcasting that information to anyone who might be a potential offramp causing a cascade to any swap system upstream of an offramp, and no one will do business with them
US Gov: k that's better