Extremes/Extremists get the most attention
simply because they can be so firm in their convictions. The people in the middle tend to be less forceful in their convictions because in seeing the possibilities on both sides of an issue, they are less convinced that their way is necissarily the right way. These are the people that, if they get to see both sides, could find the peaceful road in between; but shown only one side become mere sheep, following along with the crowd because nothing better presents itself. Of course even given that information, because of their less forceful demeanor, they usually go unheard.
It is due to this that people in general tend to gravitate to one extreme or another. Those with the most conviction in their beliefs become the most heard. If one extreme is the majority or only extreme heard, those in the middle turn sheep and follow along. And because there is often more than two extremes, even if the middle person sees more than one side of the issue, they never really see all of the sides.
At least that my view of the problem. I hope I haven't made it too confusing.
