JRF: Security is *significantly* better because:

1) it is now against the rules to bring those items. (On 9/11, at 8am, if you had walked up to the uniformed police officer and said "can I bring this box cutter on board?" the answer would have been "yes".)

2) it is irrelevant, to the real question, whether 1 or 2 or 100 people have brought in a weapon (every reported instance was an error) in the last 80 days. No one will plan a 9/11 event, involving 4 aircraft, based on the fact that they have a 1 in 10,000 chance of getting a weapon through security (even if it is a 1 in 100 chance).