Well I've never had any experience of security issues while actually on a plane but I have been subjected to the humiliation of having to run through Sydney airport in my socks as I had to take my boots off because the steel shafts in the soles set the metal detectors off and I was running late and didn't have time to sit down and lace them back up till I got to the terminal.
I've also had various items confiscated at different times like nail clippers and a book of matches the kind that are cardboard that you tear off the matches but was allowed to keep a lighter, I could have kept the clippers if i broke the nail file off it, like wtf did they think I was going to stab someone with the worlds smallest nail file I could have done more damage with the plastic stirrer they give you with your cuppa and if I had wanted to set fire to the plane don't you think I'd do more damage with a plastic lighter full of butane rather than a book of matches.
I can understand the baby crying thing and it's not the poor kids fault but I have been stuck on a plane with a baby screaming and I mean SCREAMING for several hours and it was almost enough to make me want to blow up the plane either that or start screaming myself.