According to Morris, this low level of, shall we say, attainment was found frequently during his exhaustive research. Watching it, one can't help being reminded of screenwriting guru Robert McKee's warning, that 'verisimilitude does not equal dramatic truth'. In other words, the reality is too bonkers to believe so sometimes has to be toned down.
However one leaves the cinema vastly reassured, as it means that most of the people who are currently trying to kill us may indeed achieve their aim of blowing themselves up - but not of taking the rest of us with them.