Given how much bad publicity and legal exposure costs a corporation of Sony's size I'd say that getting their affairs in order across the board should have been a bigger priority. As it is wildly unreasonable not to have taken a good hard look at every piece of infrastructure after the fist major breach I'd say absurd describes this situation pretty well.
Even if they had hired all of the top ranked security firms the first day PSN was hacked, they would still be open to attacks like this. The amount of public properties Sony hosts internationally is huge -- it would take a long time securing it all.
