Welcome to Red Dead Answers. What would you like to know?

I guess the question here is: Why are there zombies after the storyline?

Well, as you might've seen the "ending cinematic", where (spoiler alert) the mask was taken yet again from the temple, but this time by Seth, cursing the land all over again.

After that, John wakes up as an undead, and the hint box says that due to the holy water John was buried with he woke up as a zombie with a man's soul, and therefore isn't quite as the other zombies.Yes (Spoilers)Yes, but before John was killedYes, there are zombies after you beat the campaign.Please, no spoilers.

Are there still zombies roaming around after you complete all the missions and save every town, or does everything go back to normal?