They could easily go after Americans, but then they'd having things like due process and trials by jury to worry about. Instead, DHS would rather set precedent

They could easily go after Americans, but then they'd having things like due process and trials by jury to worry about. Instead, DHS would rather set precedent that a judge's signature in Maryland (a suburb of Washington DC) is all that is necessary to seize .com/org/net domains anywhere in the world. It's a fait accomplit against a foreign company, they're less likely to fight back, and the precedent extends their authority.