It keeps the perception of normality going. They're always in the public (and private) eye, so they can't hide. They're far from free.
USMC is in charge of rounding the evil up on US soil. NG would do crowd control if needed. For 3, it's not going to be needed. Once we move up to Hussein and HRC, then they'd try to cause unrest. They're losing the messaging already. A lot waking up.