"The risk of a terrorist attack is so infinitesimal and its impact so relatively insignificant"
9/11 was one of those tail-end events that proved this wrong. I totally agree with them that security has gone too far, but it's stupid to claim a risk and its associated costs are insignificant just ten years after we learned that they really aren't.
Some perspective: 9/11 cost at least 100 billion dollars in actual, immediate costs - this is over 10x the entire global airline industries' expected income this year. 100 billion dollars pales in comparison to the final price tag, which included massive loss of life, a fall in global markets, and the USA's misguided overreaction to the whole thing.
We are still paying the price, with higher security when we fly.