Actually there is a hell of alot more we could be doing to secure our nation without imposing extreme measures on our citizens. Unfortunately it comes down to the bottom line. No-one wants to spend the money on it. Spending the tax money is fine but don't ask us to fund our own security (even though we profit from being more secure).
I pointed out gaps in security years ago (sorry I have to be vague, no idea who may read from this site) to a business. You'd have thought they'd want to take care of them to protect their property and products from thieves and vandals. It would at least have saved them some insurance money. No they wouldn't do it. Too much money up front with too little return in the immediate quarters.
In more ways than one we're at the mercy of our own businessmen.