what I don't understand is how your choice of meal, ...and or seating preference on an airplane can determine whether or not you're a criminal or terrorist.

There's usually a very limited choice. Aisle or window? Maybe you like to look out the window at all the pretty little lights underneath when flying to Vegas so you opt for a window seat? Maybe you're slightly claustrophobic, and prefer to sit on an aisle seat so you don't feel as hemmed in.
Or do you always have to order the kosher meal in order to go above suspicion?
Who here really believes there is any scientific validity behind this?