Really sorry to hear about such a brutal attack in such a place, I really think you are unlucky and this is not the norm.
Know what you mean about how people just watch things happen.
Just back from Holiday in Tunisia and did see the odd unlikeley chap looking at my camera, though with a manky bag, electrical tape stuck on parts of the camera to make it look used and old and being 6ft 3 all worked in my favour.
I also chose to wrap the strap multiple times round my wrist, meaning even if i let go of the camera it was still firmly attached, if they cut the strap, the web of strapping round the wrist would act like a knot. I just hoped they don't have machete's there.
I also took a photo of one very dodgy chap and cycled the memory cards at first opportunity.