earlier there were no walls around it, you could walk anywhere. there were no rape gangs streaming in the champ elysee, or thieves looking for tourists... that was once upon a time. Sorry that you couldn't experience it the way it was meant to be, ie in a civilized nations. but at one point, by importing and allowing hordes of third worlder in, the natural conclusion is that france became a third world nation.
remember to change shoes, those aren't the made to run, and in confrontation, those are armed, to forget it. don't think help, just run, faster than they can, specially not through back alley, but on the main streets...