do Pepe Reina Should be Blamed for Liverpool way out for semis?

The one mistake done by Reina had drastically change the whole scenario of game.I dont understand what sought of thoughts would go for Liverpool manager Ragael benitez for such small mistakes. A small mistake cost them no way for semis.
Things were going in a smooth fashion with 2-0 lead against chelsa where liverpool needed only one goal to have 3 goal lead to enter in to semis. A small goal keeping mistake from Reina literally changed the siutation towards their oppostion and the defenders could not get hold of things.
A good free storke from chelsa players which could be stopped at a moment but already the man was in some sort of tension by doing a small mistake could not grab the oppurtunity to come back in the game and making way for the opposition to smooth win.