Ego's. The problem of modern footballers. Aguero's decision to take the penalty in the manner he did was all about what people would say about it, rather than just Aguero scored a penalty.
Sadly we have very few who don't have ego's of varying degrees. Even Pep's ridiculous decision to play such a poor team was all about mindgames and not about winning the fucking game. We have now managed to install a superiority complex in Chelsea with regards to games against us that has cost us the FA Cup, possibly the Champions League and will elevate them to be a problematic contender for next season's Premier League. Great mindgames Pep!