HIGHLAND PARK, Ill. — The man charged with killing seven people at an Independence Day parade confessed to police that he unleashed a hail of bullets from a rooftop in suburban Chicago and then fled to the Madison, Wisconsin, area, where he contemplated shooting up an event there, authorities said Wednesday.The suspect turned back to Illinois, where he was later arrested, after deciding he was not prepared to pull off another attack in Wisconsin, Lake County Major Crime Task Force spokesman Christopher Covelli said …