Science tells us that water behaves very predictably: It follows the path of least resistance. Not surprisingly so do terrorist groups, and the Paris and Brussels attacks followed this trend.

In both cases jihadists struck at lightly defended targets and, in the case of the Brussels airport, at a lightly defended portion of the airport, namely away from the highly patrolled passenger and baggage screening areas.

Naturally the Brussels airport bombing has led to calls for increased security at U.S. airports. This has taken the usual form of efforts to increase funding to the Department of Homeland Security’s Transportation Security Administration (TSA) for programs such as explosive detecting canine teams and increased vetting of airport workers.

Do these proposals represent “commonsense” measures? Sure, especially when “commonsense” is the most malleable term of art ever used in Washington.

I would argue that the Brussels airport attack teaches us something different. I believe that the main lesson from the Brussels airport attack is that it is time to shake up the status quo at the TSA—let’s get it out of the passenger screening business.

Read more: Push the TSA Out