The quotes seem cherry picked, but I wouldn't be so uncharitable as to accuse the maker of the video of deceitful editing.
Or, slightly more seriously:
- The video is awesome IMO, in that the editing works impressively well and makes for a genuinely good and funny song.
- Perhaps one can appreciate the video as criticism of David Cameron and supporters, though as such I think the criticism is qualitatively weak. On the other hand, it seems like a good caricature of his less sophisticated critics, in that it showcases the sorts of positions that they might genuinely attribute to their tribal opponent.