The article itself espouses similar doubts from one of its subjects:

>Barbara Walter, a political scientist at the University of California, San Diego, who was also not involved in the study, agrees. But she suspects the survey responses overrepresent the number of Americans who would be willing to turn to violence because, she says, surveys tend to overstate what people actually think. “The numbers always tend to be shocking, but in essence, are probably not true.”

Hardly sensational to lead with "all this is probably BS" but that probably wouldn't get as many clicks. For sure the alarmist title got me to read it, only to wind up feeling I wasted my time.