As they shouldn't, he hasn't earned it. He took a dump on the face of the best talent on the roster and said "fuck you, I don't have to do SHIT but show up and pin you after you carry the entire program". Disrespect begets disrespect. Undertaker is a selfish, arrogant, broken down old has been who can't give it up, who doesn't give one shit about the next generation of stars and helping the company that made him thrive. It's always all about him.
Of course Miz didn't see it coming, he didn't have time to react at all as Kofi executed it far too early, Miz had only just turned round and he didn't have time to get out of the way, pretty bad botch by Kofi.