Sorry Piltdown but you clearly dont have a clue about how the Intelligence Services operate or about what they have contributed towards our security in recent years.
Also, passenger profiling has been a counter terrorism tactic for a few years now.
This article from the Guardian may be of interest....unless of course you dont believe any of it.
MI5 chief says 34 UK terror plots disrupted since 7/7 attacks | UK news | The Guardian