The deeper question is how did they come to believe that stuff in the first place?
Through relentless right wing propaganda applied for decades. A lot of it is the kind of stuff where if you're dumb enough to believe it then you're too dumb to have thought it up yourself.
It manifests itself as some sick emotional satisfaction gained through outrage & self righteousness, some apparently delicious sense of persecution & a cult like devotion to what's best described as religious belief masquerading as politics.
Well . . . there's the palaver and exaggeration.
There's also the seeming rational common sense that you can't infer or deduce certain things from other things amplified beyond a simple presentation of facts. So various incomplete rationalizations take on the aspect of certain Truth, as inevitable consequences.
Throw in alarums and fear, a feeling of uncertainty, and one has a malleable base of support.
Meanwhile, the Administration is attempting a public relations effort to give people some sort of confidence in the face of all the misinformation and hype. Today, they feature a photo-op of the Pres, Vice-Pres, Secretary of State and others meeting with the JCS and other officials to discuss a strategy against ISIS.
Immediately after, the media announced that Clinton will weigh in on her own anti-terrorist, anti-ISIS strategy.
Now -- keep in mind that in the waging of any war, even if you don't want to call it a war, it is important to keep your battle-plans and strategy secret from the Enemy. This of course works against a democratic society and its requirement of disclosure. And we saw how this caused ISIS strategies to morph and change, even as the GOP was egging on the Pres to "explain his strategy against ISIS."
So the photo-op reveals nothing of a strategy, except the President's concern that we "have to move faster."
And what Hillary says may be no less intended to mislead ISIS than to provide a pablum of reassurance to the base or the potential base. Who knows, really? And what would you want, after all? "Tell me the strategy so I can be sure you're doing your job?" And meanwhile, so that the Enemy can play catch-up?
The entire world is under a sense of threat from those monsters, but we have the loudest mega-phone, and we're "King of the Mountain." At least one faction in the political struggle wants to thump their chest and shout that we're "King of the Mountain." That's as much as a lightning rod for terrorist preoccupation as anything else.
Wait a minute . . . OK . . . I got it right. I didn't say "Trump their chest . . . "