I don't see it is a gross infringement of my liberty.
Frankly, I'd like to see some means of making terrorism so costly that no one wants to do it. As long as we can't have the fortitude to hunt them down and waste them, I'm fine with going through a metal detector and having my stuff scanned.
What's different about the world today, and the world fifty years ago? Didn't they make bombs and guns then?
The presumption of guilt is not a gross infringement? George III could not agree with you more. The founders, who knew him, could not agree with you less.
How do you make something too expensive for someone willing to die in the process?
Answer; Look at his motivation. These people believe, for real, what their Holy Book says and that we are the Great Satan and we are a mortal threat to their way of life.
Ron Paul learned, the hard way, that we are NOT allowed to discuss such things.
Yes, they made bombs and guns and we had no armies in their Holy lands and we were not supporting corrupt regimes (we were starting to).