First of all, it is VERY important that you are uploading your videos natively to Facebook, as opposed to simply sharing a YouTube link. Facebook will penalize you for sharing the link, but greatly reward you for uploading the video natively.

Whether or not you are already doing that, the easiest way to get more views on a Facebook video is to run a video ad, thus boosting its reach. You can boost it just to your followers, to your followers and their friends, or to any targeted group that you think might enjoy it (people who like BBC perhaps, or people who follow politics). When it comes to video ads, a little bit of money can go a long way.