So they spelled out the murder of joffrey by having the two most manipulative, least trustworthy characters come right out and baldly say it in plain english. And everyone is just accepting what they say at face value?!?!
Does it really not raise any alarms for anyone else when little finger, that is little finger just came right out and explained something? Or when the queen of thorns just suddenly decided to speak unguardedly, while still firmly inside king's landing? I don't have any idea what the characters stand to gain by lying in such private settings, that much is true. But if little finger is saying something plainly, even if it is for the "dumbed down tv audience", then there's something else going on.