Sosua has a diversified culture, which makes it unique, and appealing to some folks. On my limited visits, he is my observations of things and two cents;
Non - Dominican (expat)
1. Those that live there full time and are retired
2. Those that live there and are involved in work/business ventures
Non - Dominican (tourist)
1. The A1 tourist
2. The non AI tourist (family, couples, etc.)
3. The non AI tourist ( in search of chicas)
Non - Dominican (Haitian)
1. They are 'expat' in a sense
Dominican
1. Local (El Batey, Charamicos, etc)
2. Not local
Now throw in a healthy dose of corruption (police, administrators), limited social services, putas offering services 24 hours a day on one of the main streets, bars everywhere open till 2/3 AM, firearm culture, massive Haitian poverty across the border, and you have a good mix for almost anything goes.
NOW - add the drug culture, which I gather was almost non existant until say 5/7 years ago. Whether it is trafficking or local use, this is major problem, on top of all the rest. But apart from some expats being involved in major international deals, the average Sosua expat and tourist stays away from this, it is only the locals that are involved, so the vast majority of violence and related crime should not affect non - Dominicans, unless you are unlucky to be in the wrong place at the wrong time (crossfire, or mistaken identity) OR if the problem continues to escalate, you can be mugged and robbed for anything of value in any part of town.