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however you must do something

Again, the assumption seems to be that we either stay the course we currently pursue or do nothing. I suggest there are other options.

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As nebulous as it is , you can measure success by the declining number of terror attacks.

Really? I daily adorn a tin foil hat to protect against attacks from alien invaders. I also daily measure the success of this tactic by the declining number of alien attacks upon our planet. Therefore, the wearing of tin foil hats must be warranted, no?