You'll appreciate fishing when the police walk in on an actual threat....let's say terrorist plot or planned bombing/shooting by some idiot. yes, it is inconvenient for you, but even if it's effective 5% of the time to go fishing, it's still effective, and it still saves lives, despite the minor inconvenience it may have caused you.
Hell, I get triple checked at American airports sometimes because of the way I look. I could give a shit as long as the dude who looks like me, standing in line behind me is also triple checked, because he may very well be the douchebag with a shoe bomb. These are minor inconveniences to me, for the safety of everyone. I accept it, and I think it's a great inconvenience to go through as long as the real threats are caught in the process.