Speaking from Europe, you don't know invasion. Invasion is not a bomb in a marathon, and it isn't an attack on a skyscraper. You have never seen invasion, and realistically it's not a danger to the US.
Invasion is certainly not such a risk that widespread privacy invasion is warranted.
You are scared. You should also get some of the "brave" out of your lore and into reality.
Speaking from America, you sound like a pretentious stuffed shirt.
Through the miracle of broadcast media, like the printing press or YouTube, it is wholly unnecessary to experience an invasion to know that it is something worth repelling.
Besides, we American have experience with repelling invasions both large and small and from regular military and irregular forces, just not in recent years. Try searching on these topics: American Indian Wars, French and Indian War, War of 1812, Aroostook War, the Texas War of Independence, the Battle of Gettysburg, Sherman's March to the Sea, and the Aleutian Islands Campaign.
Lately, we Americans have been doing a good job of keeping the fighting over there instead of over here, and I imagine PRISM has been a big contributor to that success.
You imagine that without PRISM, we'd be fighting or at least have fought a war on American territory in recent years? Who would be the supposed aggressor?
Invasion is certainly not such a risk that widespread privacy invasion is warranted.
You are scared. You should also get some of the "brave" out of your lore and into reality.