Hershel's death in The Walking Dead Season 4 was one of the hardest and most shocking things for me to watch in the series. It really hit me hard, and it changed the whole dynamic of the show and the characters who are going through this insane journey.
THR has released a bonus clip from the upcoming DVD and Blu-ray release that features the cast and crew discussing the death of Hershel and what it means. For example, Showrunner Scott M. Gimple says that the murdering of the character represented the death of civilization.
You can watch and listen to producer Gale Anne Hurd, and stars Andrew Lincoln (Rick) and David Morrissey (The Governor) talk about the shocking death in the video below. This is just a clip from a much longer discussion, but it's worth checking out.