I'm curious as to what they would have done if one of them actually did find a weapon let alone someone deranged.
Die. They would die. I don't know why trained, armed security isn't standard in all large venues these days. Probably money and politics.
You do realize that cell phones didn't always exist, and people still managed to survive?
What is your point? A lot of things didn't used to exist and yet enough people to survived their non-existence to continue to life of the species. That doesn't mean it is smart to get rid of all those things.
Credit cards aren't a system to make payments easier.
Except they are. Credit card companies charge merchants fees in order to be part of their network. As long as you are spending with their cards, they are making money by having you as a customer regardless of the fact that you are not allowing your balance to incur interest.
"Wish not to seem, but to be, the best." -- Aeschylus