It is smart, in an evil perverted way.
Doctors, like airline pilots are put in positions of trust and are able to do great harm with little or no help.
Most western countries love to import medical professionals from a variety of different countries. If a terrorist is patient and ruthless, they can worm their way into places where they can inflict the maximum amount of damage. Therefore, they are trained, find entry less restrictive and then wait for the most opportune moment to strike.
There is also the potential for larger scale terror too. Perhaps the goal is access to US bioweapons.
Sodom Hussein Obama wants more immigrants with AIDS...
The shooter, Hassan, was of Palestinian descent. Both his parents came from near Jerusalem.
Sure tosses the theory that terror is born of poverty and lack of education.