Agreed.........Frankly I'm surprised more low level, less complex attacks haven't been launched........
.I think their failings to date Can be attributed to both the massive security and intelligence apparatus, coupled with an apparent desire to attack targets with a more complex manner……..
Instead of truck bombs, airlines or the use of WMDs, several dozen suicide bombers adorned in explosive vests, detonated across North America in coffee shops, grocery stores, shopping malls and aboard transit, though not reaching the same impact as a 9/11, would certainly shake confidence and be far harder to defend against.