Alderman Bob Fioretti, whose district will be most affected by security efforts, was warning residents to leave town during the summit. He told local reporters "I've been advising people, if they can afford it, leave town."
He's a politician from Chicago. If he's telling the upper and middle class to leave I would imagine it's only so the poor could loot the homes and in effect, redistribute wealth. He probably passed a law in secret allowing squatters rights to apply to private property when abandoned out of fear.
What I noticed is if you watch the videos the general public got something right about guns! I am sure the military people in the choppers did have machine guns lol and not the semi-automatic versions.