I don't have a perfect answer to your question.IMO, I can only think that all these stringent security checks can only help to ensure the security of air travelers.
I guess it is "better safe than sorry."
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Perhaps you travel as much as I do. If so, you know it's pretty much luck if those screeners catch anything. I've carried liquids, screwdrivers and whole tool kits and not been stopped and in other airports stopped because I had an empty 5 oz container in my pack. I explained the rules apply to more than 3 oz. of actual liquids or gels not containers capable of carrying more than 3 oz. Still confiscated it.
Screening is way too inconsistent with many rules that make no sense. Now scan me with tech like they had at the train station in Total Recall without giving me cancer and you've got something!
Cheers,