"The problem here is that the story is not about the admitted Internet troll or his video, which was shared last week by the president himself. The story here is that there are people in the White House who trawl the Internet's underbelly for weird and sometimes objectionable content, and that it's being done on the taxpayers' dime."

They are both stories, and they are both related.  You need to establish that the creater of the meme is some troll (and, as it turns out, the creater of racist memes as well) before you can say that the White House "trawls the Internet's underbelly".