It seems weird to expect them to jump directly to the nuclear option of quitting. Making a demand like this is a first step, and it may turn out not to be necessary to quit if the employer caves.
Fair enough! Though, you do realize that the whole ICE thing has been baking for nearly a year now? The central question I think is: at what point does the employee realize that discussion is more for his/her sake than for the sake of actual change?