Well, how many bombs have you heard of that DID make it on?
To be honest, it isn't the bomb's presence on the plane that bothers me as much as it blowing up. If all the bomb did was fly with me, it wouldn't hurt me. Just like the knife that I
accidentally carried on board didn't endanger national security or the safety of anyone on the flight with me. It just traveled harmlessly along in my purse.
To put it less flippantly, I haven't heard of any more flights highjacked by terrorists or blown up by explosive devices since 9-11. I don't know whether that is because
of the heightened security or whether no one else has seriously tried.
Some of the security measures are nonsensical and do nothing to increase our safety while seriously inconveniencing thousands (millions?) of people, wasting valuable products and creating hazardous materials disposal problems unnecessarily. Some
of the security people are snide, sarcastic, nasty, rent a cops on a power trip. A little common sense would go a long way, but government agencies who operate in a "reactive mode" are unlikely to operate smoothly and rationally.