Possible reasons Daley would want to spy on those children playing in the fountains at Millenium Park:

a) Jihadists come in small packages.
b) He’s under pressure from the unions to make sure there’s no “cleaning” (i.e. trash pick up) being conducted by non-union/civilian workers.
c) Daley loves the little children, all the children of the world.
b) He owes Cardinal George a favor. (ouch!)

The Tribune says the Department of Homeland Security paid for these cameras, so we know someone is watching, we just don’t know who.