It's interesting that many from the UK will easily point the finger at others and complain about things the French, Germans and in this case Mexicans do while hiding their own "non-sense" behind the convenient word "procedure".
I was based in the UK for a year and found airport security personnel anything but pleasant especially towards flight crew. At MAN I had problems with their iris scan machine every time. Additionally, I was told that I couldn't bring this or that with me (they really disliked my camera). I have never ever felt so much hostility and social envy by security personnel than in the UK.
But it's all procedure!