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Why should it be?

The primary impetus for modern TSA was a group that figured out modern jets were useful weapons if diverted off course. While train diversions are still dangerous and catastrophes, they are nowhere near the same level of useful weapon in the hands of terrorists.

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The primary impetus for the TSA was that people were afraid and it made them feel safer. The TSA actually accomplishes virtually nothing to prevent hijacking compared with the addition of armored cockpit doors and cockpit approach monitoring procedures.

The TSA does theoretically screen for bad actors and explosives, both of which are still relevant to rail travel, even if they're potentially less threatening there.

I thought the purpose of the tsa was to make people feel less safe / have more reminders to fear - thus making people less likely to demand we slash the military / police / other security budgets. I suppose they do add to the expense of moving drugs, and make it harder to move large sums of money - so people who control other routes are able to extract higher prices for them, but I don't think that in of itself actually makes people feel safer.

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