1. Are you an expert on airport security OR explosives OR non-metal weapons? No.
2. Why do you even care? They are trained people patting you down, not some douche groping your junk. Do you complain when a doctor gives you a testicular exam? In that case, the doctor IS feeling your nuts, one by one, with very careful precision.
3. Most airports use scanners, not pat-downs. If you don't want to use the scanner, they pat you down.
4. Our borders are also hundreds and hundreds of miles long. It takes much more money to protect every inch of borders than it does to install scanners in airports or require pat-downs in certain cases.
5. Last 4 or 5 times I have been through airports (including BWI, Chicago, and Denver) I haven't been forced to go through a scanner OR to get a pat-down.
So I don't see what the big deal is.