Wow... what an interesting topic.
Everyone, please step back for a second and take a deep breath.
My 35 years in law enforcement, much of that on the street, gives me a different perspective. The media brings every major crime, regardless of its location, into your livingroom and makes it personal. Hearing that over and over and over makes the world appear to be a much more dangerous place than it really is. A little common sense, and situational awareness will do much to keep you safe anywhere in the world that you choose to go.
Just because there are "x" number of murders in a particular city, state, or country doesn't mean that just because you're walking through you're likely to be a murder, robbery, or assault victim and that's true even carrying an expensive camera in a violence-prone neighborhood.
Generally speaking, outside of countries currently considered 'war zones' or those fighting not to be controlled by drug cartels, your lifestyle is what makes you a likely murder victim. Most murder victims continue to be gang members or associates involved in illegal activity. Frankly, you're significantly more likely to be murdered by your spouse, a friend, or an acquaintance. That's how most homicide investigations are solved... the victim knows the suspect. Last, assaults and street robberies do occur, but they so infrequently result in a murder compared to gang and acquaintance murders that they're almost statistically insignificant.
Unlike thirty years ago, cameras have no value on the street any more as proceeds of robbery, and that especially applies to Leicas. No street thug is going to know how to unload one for cash in a world where every one has a cell phone camera.
Last, remember that if you don't conduct yourself like a victim, likely any potential predator will pass on you and move on to someone who appears less interested in potentially doing them harm. My mantra for years has been this version of the twenty-third Psalm... "Yea though I walk through the vally of death, I shall fear no evil... for I AM the meanest SOB in the valley." If you don't ACT like a victim, likely you won't BE a victim regardless of where you go.