Security is a trade-off. This is something I have written about extensively, and is a notion critical to understanding the psychology of security. There's no such thing as absolute security, and any gain in security always involves some sort of trade-off. Security costs money, but it also costs in time, convenience, capabilities, liberties, and so on. Whether it's trading some additional home security against the inconvenience of having to carry a key around in your pocket and stick it into a door every time you want to get into your house, or trading additional security from a particular kind of airplane terrorism against the time and expense of searching every passenger, all security is a trade-off.
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