You're right actually.
But you won't get the full picture until you look at the matches where we conceded these goals, the timing of these matches etc. For example, i wouldn't really count Milito's goal against us in the 88th minute of the match because we were already leading 3:0 when he scored.
But 3 of these 5 goals did cost us points. Fiorentina, Palermo and Napoli. All these matches were in the opening 7 rounds of serie A, which was our crisis period. We weren't concentrated, that's true, we played very bad and we were losing points.
But 13 rounds passed since the Napoli match and we're not letting late goals anymore, especially in situations where we don't have a secure lead. We did let one more late goal against Lecce, but we've shown even higher concentration and character, by replying with another goal.
Lack of concentration was indeed a problem, but i think we fixed it.