I beg to differ. They certainly have made the decision to openly display the American flag during their protests and demonstrations. And why do they do that? Of course it is to say that they are patriotic to be in favor of Hitler or trashing the Wisconsin State Capitol building, or whatever it might have been. So there is a clear "hijacking" of the flag there, if that's the way you want to put it.
But maybe you want to say that they haven't effectively pulled it off--not like the users of the Confederate Battle flag have allegedly done? They didn't really "hijack" it, in other words.
Well, then, you are wrong again.
While some unsavory groups have used it (just like the unsavory ones that have tried to wrap themselves in the American flag have done), that battle flag is the official logo of the Sons of Confederate Veterans, a completely normal heritage organization like the Daughters of the American Revolution (DAR). And the South Carolina issue where this started was...what?? Answer: It's a Confederate VETERANS' monument!