If WC's are the sole criteria, I wouldn't call Dhoni or Kohli clutch players either. Both had averages in the low 30s by the end of the last WC, despite it being in their backyard, and one has only gotten worse in this one.
Amla has played 3 WC knockout matches and the only one that came in the 50 over version was the one in which he was dismissed due to a shoe.
That's a good point.
But let me present some examples.
If you take a poll among neutrals on who is a better clutch player amonst Dhoni and Sachin, who do you think will win?
A poll is ONLY about clutch player and not who is the better player?
I would say atleast 70% would vote for Dhoni.
Inspite of him not having stats in the same planet as SRT's in WCs or tournament finals.
Why?
Cos when you watch them play, you know who is clutch.
SRT averages 56 in tournament finals and 44 overall. Statistically one can conclude SRT raises his game in finals which isn't exactly true if you watched him play (sure he has some memorable final knocks but you can't exactly say come the finals, SRT powers up).
Bevan is regarded a clutch player and no one even knows what his WC stats are (I think its good but don't remember).
Kohli is regarded by most Indians and neutrals as more clutch than SRT even though he is yet to perform in World Cups and finals like SRT. That's because as of now, Kohli's game RAISES when his team needs him. Yes he hasn't had a great WC 2011 and if he doesn't perform in this WC or in future tournaments, his clutch player image may get tarnished but you just had to see his dominance during Hobart (when we needed to win like hell), Dhaka, T20 Semi Final, Final, CT 2013 (partly - won't say fully) to know he is well and truly the most clutch player in the world now.
When you score and HOW you score matters a lot. When you watch the game, you know who raises their game when their team needs them the most.
SRT may be a better Test batsman but most Indians would say Dravid was a better pressure player than SRT in tests. And Laxman was the MOST clutch test player for us EVER.
So people rate Dhoni, Bevan as the most clutch not because of World Cup stats but because how he performed in general.
When you watch Amla, you don't feel the same.
How many neutrals will come running and say Amla is a clutch player?
None. Almost none.
That's because he isn't (as of now).
He is a great player no doubt but not a clutch (as of now).