This is true, and yet almost all serious attempts against American presidents have been lone wolves. Even worse, they tend to be lone wolves who are quite liter

This is true, and yet almost all serious attempts against American presidents have been lone wolves. Even worse, they tend to be lone wolves who are quite literally insane in terms of their motives (as in, rather than being convicted of attempted murder they are found legally insane and institutionalized). So the Secret Service protection is fairly comprehensive.