Republicans rarely criticize Obama for lack of empathy - in part because liberals have traditionally been seen as standing up for the weak and the vulnerable. Conservatives can be just as empathetic. But they believe that in most cases it's not government's role to be the primary dispenser of empathy.
Other countries such as Israel successfully employ behavior detection techniques at their airports but the bloated ineffective bureaucracy of TSA has produced another security failure for U.S. transportation systems.