I find this appalling and very sad indeed.
What sort of briefing do these security people have? They work on a completely random system, picking on whoever they "have a hunch" about - very 1970's TV detective!
The only way to run security in my opinion is to treat every single passenger to the same system - a security treadmill if you like. Until this is the case, individuals will take a chance on not getting stopped.
Bring in more search staff, open more security lanes, make the whole security area larger and more accommodating. Sadly, I think the airport directors would see this as wasted space that could otherwise be used for revenue earning premises.
Shame on the security people concerned in the above.