Why is WWE Humanizing The Undertaker?

Something seems off about AJ Styles out-of-place promo on RAW about the Undertaker match at WrestleMania 36.

Kane (WWE)

Rob Van Dam questions The Undertaker's American Badass gimmick: When he was a biker, was he not a dead guy? Ok, so he was not a dead biker? I thought it was just a different side to him. Like, this is Undertaker on Halloween! : r/SquaredCircle

WWE's 10 rulers of 'Hell

The Undertaker Believes Fans Have Become 'So Desensitized' To Risks Wrestlers Take In The Ring

Michelle McCool - News - IMDb

What would happen if the Undertaker retired from WWE? - Quora

WWE Inbox - What's so intimidating about The Undertaker? - Episode 49

The Brothers Of Destruction Open Up

WWE's 10 rulers of 'Hell