After watching a movie villain toy with the hero, murder civilians or threaten the world, the audience would feel cheated if the story didn't conclude with them getting their comeuppance.
From a screenwriter's point of view, killing off the hero's nemesis is harder than you would imagine. The antagonist simply can't meet their end in a mundane or generic way.
How anticlimactic would it be if Darth Vader or Thanos died by being shot or stabbed? Kicking the bucket for baddies of this calibre needs to be a bit more creative.
If executed perfectly (literally), the death of a villain can be one of the most satisfying moments in the entire story. Whether you loved or loathed Gollum, King Kong or Khan, you felt something when they finally shuffled off the mortal coil.
But this isn't always the case. There are times where The Big Bad's death doesn't work. This might be because their demise is unoriginal, over-the-top, or unintentionally hilarious. Even the best and most memorable villains can be ruined because the writers decided to kill them off in the dumbest way possible.
James Egan has written 80 books including
1000 Facts about Superheroes Vol. 1-3
1000 Facts about Supervillains Vol. 1-3
1000 Facts about The Greatest Films Ever Made Vol. 1-3
1000 Facts about Video Games Vol. 1-3
1000 Facts about TV Shows Vol. 1-3
Twitter - @jameswzegan85