Why do we spend money on terror watch?

Among the 2.3 million migrants that they actually encountered last fiscal year was 98 people on the terror watch list. This of course doesn't count the ones who got away without being spotted.

Why do we spend billions on terror defense when they can just go though Mexico with the other 1,600 a day?

Why not save that money and try to save our country that's currently falling apart at the seams?

Why do we spend money on terror watch?
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