Breitbart seems to have become a more conspiracy theory-oriented and sensationalized site since Andrew’s passing. They’re going to lose serious credibility if they post stuff like this and it doesn’t come true.
If the information is credible, then posting it decreases the chance of it occurring. I’d post according to my best assessment of its accuracy and my conscience and not base it on whether or not it enhances my future credibility (or revenue, as the MSM does).