OP didn't ignore warnings - he was unaware that he was in possession of knives. Under civilized legal systems, either intent or harm is required for a crime to have been committed. Neither is present here.

The proper solution to the larger moral hazard issue is, as always, to appropriately assign liability. Civil recompense for the victim's time, emotional distress, and other damages (including all legal fees). And in extreme cases like the article, put the criminals (TSA goons and "blue shield" cops) in jail.