You can't make security policy decisions based on hypothetical horror stories alone. If you don't balance fear with reason you end up with ridiculously expensive policies that do absolutely nothing to increase safety.
Exactly! I've seen 500+ people at security checkpoints at Chicago O'Hare. A couple people with AK-47s could likely kill far more people than a shoe bomb on a plane.
That this sort of thing hasn't happened seems an indication of just how impotent Al Qaeda is these days.
Responses like car searches coming into the airport with guns pointed at you and other things that will make our current wait on getting to an airplane look like a distant dream. And picking people up at the airport will become more painful than a dentist visit.
India has a history of terrorist attacks from islamic extremists (largely originating in pakistan). The US has no such history.