You're kidding right? What people SHOULDN'T forget is that there are predators everywhere. Children are being taken right out of their own homes (within the past month in Calif.) Just last week it was reported that an employee at WDW was arrested for child porn. Anything, accidental or otherwise, could happen to a child (yes, 14 is still a child) roaming on his own in a foreign place, even his own city.
I agree that the world is a dangerous place. Much more dangerous it seems, than when I was growing up in NYC in the 70's.
I remember taking the subway across town by myself at 12. It was a different time.
However, as you pointed out, children are even being taken from their own homes/rooms/beds. So, nowhere and nothing is 100% safe and/or controllable. Bad things will happen whether you are there (sleeping in the same house one room over) or somewhere else.
For me, (and this is just me, my opinion, and in no way means I recommend it to a parent who doesn't feel comfortable) I feel like there is a point where you just have to let go and trust. I cannot control everything that is going to happen. And I don't want my kids to be so fearful that they don't get to have any experiences or independance. In just a few years they will be off in college doing their own thing and they need to have learned how to navigate on their own by then. A 14 yr old is in HS already. I think back to my HS years, and I was given a lot of freedom. By 15 they are getting ready to be driving here in Florida. In some states they can already have a DL even!
In my case, my son is very street smart and often is more careful than I am when it comes to being aware of his surroundings and removing himself from situations where he feels unsafe or where it is sketchy. I have always taught my kids to listen to their inner voice that signals them that something is......off, and to follow their instincts and play it safe. I would have no problem letting my son off in CC without me. Depending on which port and the circumstances, I would let him go alone in a foreign country as well. My baby sister was 16 when she went on a European trip and while she was with an adult, she was allowed to do some exploring on her own as well. In my area of Florida, there are a lot of exchange student programs and these kids are 15-18 years old, being sent across the globe to spend a year with a family of strangers.
It really depends on so many things. Ultimately, it is up to each family to make the call on what they feel comfortable doing.