At the end of the episode, they were trying to depict how the media exploiting us with sensationalist news means we miss what is in front of us.
In S01E01 The National Anthem, we find out in the end that Princess Susannah was released 30 minutes before the pig sex occurred. So if people were not busy with sensationalist news, they might have discovered that Susannah was roaming in the street to get saved.
But the general public never got to know about it and the kidnapper even committed suicide. It continues the theme of Black Mirror's bad effect of technology and the media. The general public were enjoying the sensational atrocity on live TV rather than seeing what's happening next to them.
And on the one hand Michael Callow's popularity score increased for the sacrifice he took (which was never required in the first place) but on the other hand, his wife can't come to terms with what he actually did.
And in a later episode Shut Up And Dance, there is an "Easter Egg" suggesting they are getting divorced: