You've missed the point, I think.
If the Smith-Morra were as horrible as LT says, Anand would've taken out an hour to prepare 3...dc3 against Esserman. The fact that he went for the pragmatic approach means that Black isn't obviously better, nor winning after 3...dc3, otherwise he'd have just done his homework and taken an easy win.
There are 300 openings and 5000 subopenings.
he can not prepare for everything.
I don't know why I have to explain everything to you. Marc Esserman is a well-known specialist in the Smith-Morra. Even if Anand had no idea who Esserman was, he could check a database and see that Esserman plays the Smith-Morra. The Smith-Morra was then played in the game.
300 openings and 5000 "subopenings" are irrelevant.
You really could not be so stup*d.
And has been paired with Esserman probably just an hour before the game, and most probably, he has been having lunch during this time.
1 c4 e5 2 Nc3 Nf6 3 e4?! may or may not be strong against computers, but it's useless against humans. In fact, multiple 2600+ players have played this position from the Black side a tempo down (1 c4 Nf6 2 Nc3 e6 3 e4 e5!?).
Also, what about 2...Nc6 - ? There, I suspect e2-e4 is even worse, as ...Bc5, ...d6, ...Nge7 and ...f5 is a pretty coherent plan (that I learned from facing 1 e4 e5 2 c4?! a couple times as Black).