However this can be played in reverse as well. Because there is a non-zero chance for just about everything, ridiculous ideas can be floated along the lines of "Well, we can't rule out the possibility that..." As Lawrence O'Donnell recently explained to Rachel Maddow
It’s “impossible,” fellow anchor Lawrence O’Donnell told Maddow on April 7, to rule out that “Vladimir Putin orchestrated what happened in Syria this week – so that his friend in the White House could have a big night with missiles and all of the praise he’s picked up over the past 24 hours.” (Full story here.)Well sure. It's impossible to rule out the possibility that Adele is channeling John Lennon, or that Barack Obama is actually a space alien, but that doesn't mean that any sensible person subscribes to the idea.
It's a dishonest formulation.