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.
Sheamus really is the posterboy of WWE booking in 2013. "Babyface can't stand being worse at something than a heel, so he acts like a dick. Twice in one week. Cheer when he thumps his chest please, monkeys."
Agreed, why would they possibly think it was a good idea to book multiple segments where Sheamus makes an unprovoked challenge, is beaten fairly and then reacts by tricking his opponent and sucker-punching him for no reason?
And I bet the commentators try and play if off as Sheamus being the good guy like they did on Raw, despite the fact that anyone watching will no doubt be wanting Henry to beat the shit out of him.