While they didn't know it then, current America has the "War on Terror" which extends way beyond "traditional" wars, and includes lots of rights violations.
I live on the South Side of Chicago, and we and the west side get treated a WHOLE lot different than the Near North & Downtown areas. If there were even potholes there, they'd get a news story, community and it'd get fixed right away. And all the news for their restaurants & such. Meanwhile, the rest of us suffer government & economic neglect.
"future" Detroit has similar economic depression, where few people will stand up for the rights of citizens, and those that do often get ignored.
The ED-209 would wipe out some of the gangs (considered "terrorists"), scare the others, sell a few toys, and then get sold to the military. (That was the REAL goal of the ED-209). The innocent people killed will be "unimportant" people (i.e. those without money/power), so those deaths could be hidden/downplayed.
Some will work well...those that don't would need the repair & maintainece. The Military (& govenrment who voted for it) would be too embarassed to say they wasted XX billions of dollars, and spend more to fix the problem, and spin it to justify the extra cost.