Quite frankly, it's impossible to know what's going on - until something actually happens.  That almost all the current terrorist activity is the responsibility of certain factions of a particular religious faith does meant that, bills in Parliament notwithstanding, those are the people our governments should be and are looking at to prevent the next attack. I suspect there's a lot more that COULD have already happened that we never hear about, but was stopped due this vigilance.  

Of course, on the other hand, it's sometimes hard to tell who is profiting enormously from all these security measures, and how warranted they all really are.  

And these of course are the twin prongs of confusion in our society today, and have a lot to do with the suspicion so many now have of authoritative statements about such things as national security.