A very good point - my apologies for missing it earlier
What disturbs me is that I cannot see how such events can be stopped.
I'm smarter than the average bear but I certainly don't hold quantum physicist levels of intelligence although I have to admit that my knowledge of DIY-surgery is greater than most
But even I can see that carrying on a device means that it may be discovered.
The average human being can, with a few month's (pain-free

) practice 'accomodate' an object of over 1 litre in capacity. Certainly enough to blow a hole in the side of a plane...And take out a wing if you're sat beside one.
All the 'plots' that we have been told about (shoes, liquids...) have been rather...dumb when you think about it.
So either we're facing a daily threat of being blown up by a group of people with two-digit IQs or we're not being told the whole story
*n