If you believe these people are 'a bit dim' that says more about your limited understanding of IS I'm afraid. Many of them are normal intelligent people who truly believe they are doing Gods work and that is why they are so dangerous, dim they are not. The likelihood of an Albion steward...
All this extra security is all rather pointless though really, the stewards look into bags and do a cursory pat down. They have no idea what they are looking for and what idiot armed with guns and a suicide belt is going to dutifully queue up and then allow his bomb and weapons to be found by...