Only the American mind can comprehend leading to the deaths of tens of thousands of your own people for the sake of 3% of your economy. As long as the line goes up.

If we're taking the $1T figure seriously, let's take the other figure seriously too. Let's slash it to be more conservative while we're at it and say it would only save 90k lives. Do you think 3% of your economy is worth sacrificing to prevent the equivalent of 30 9/11s? And that's before considering that other people here already explained how these 3% are offset by other gains - if not completely then still substantially.