> Then let’s extend the metaphor to the immediately practical. I haven't seen a poliovirus, but I trust getting a polio vaccine will help prevent me from getting polio.

That is not immediately practical.

It would be if you were in an actual situation which is threatening to your health. But are you? Or is it a fear that one day you may be (a non-fact ATM), so that you are taking preemptive measures?

Similarly governments take preemptive measure to spy on everyone, just in case.

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