elgnin
" So how can so many get it all so wrong"
Yes, most of us here are professionals, many with degrees, and we have been trained in critical thought but unlike you we don't rely on web-sites for our primary source of information... is it just possible you are the one who is getting it "all so wrong"?
Most of us go through airport screening everytime we come to work. Yes, we are aware of what goes on, and yes, we are entitled to "vent our spleens" when we see, for example, gallons of liquids being rolled through into airside for commercial reasons whilst security are dismantling our briefcases.
You said .." All staff, crews and vehicles are also screened"..
Do yourself a favour, rather than relying on web-sites or talking to people down the pub, take a look at the way, say, vehicles in particular are screened at most UK airports - then I suggest you'd realise what a charade this all is.
Oh yes, and do yourself another favour - if you want to join a reasoned debate delete the last sentence of your posting, the one implying that the professionals here are ignorant...it makes you sound arrogant and badly informed.