But in any case, you seem not to have noticed that the current breed of terrorist has no problems dying for their beliefs so the issue of people flying separately from their luggage is more or less irrelevant these days.
And that is the rub, what the "current breed" of terrorists do is irrelevant, pre Sept 11 nobody had flown an airliner into a building. Terrorists are constantly looking for weak points in the system. It is important we do not give them opportunites by relaxing in key areas. As Captain it is my responsibility that everyone who boards the aircraft is supposed to be on it. That includes every groundstaff members' id being checked. I can only delegate that role to my crew, and in any case would prefer there to be more than one line of defence.
I would suggest that anyone who really gets bothered about showing their boarding pass on the aircraft maybe needs to relax a little.