I don't know about that..I often worked out there, I moved from Florida in 2006 (THANK GOD!) but spent most of my work day driving around the North East and South Side of Lake Okeechobee.
If you are not from the area then you can't understand why, you would need to visit. ALL OF Lake Okeechobee is not poor and Dangerous but much of the south part is, Pahokee, BelleGlade etc, and parts of the North Okeechobee itself may be a bit poor but not Dangerous but outside of PBC, mostly Martin and Okeechobee Co.
The South end is all farming and I mean 100% farming, sugar mostly but some other things too. Mostly migrant hispanics and local african americans but the economy has changed and even minimum or less than minimum wage workers are out of jobs. Equipment and machenery has taken many jobs away, weather conditions going up and down over the past several years has killed off crops so there is very little for workers to hand pick, and many farmers have been too poor to plant as much as they have in the past due to fertilizer costs and fuel costs. Fuel to power the machinery and petro products are also used in Fertlizer so that price has gone up too. Drug of choiceis coke and crack dealing so you have a lot of violence due to that.
Most of the south end was wiped out in the hurricane of 28' I think ? Not sure of the year but tens of thousands were killed in the floods when the levy broke and many were burried in mass graves. Remember that it wiped out everything so I would not be surprised if society in that area is just further back because of it.
The north end, is rural and not as swampy so most of it is cattle farming with a lot of citrus farms too. It's old family farms and some corporate farms. Wages and income from the cattle industry has always been higher so the average income and home is much nicer than in the sugar area on the south coast of the lake. Land is of much better quality and flooding danger is not as bad as it is on the south end. It's still rural but not as behind the times as Pahokee and Bell Glade. Drug of choice is a bit of pot but a lot of Meth manufacturing for distribution, drug violence is very rare since dealing in the area is not the intent just the rural manufacturing process.
I also forgot to say if you are not from the area the entire region is fully covered in Mosquitos about 10 months of the year along with various poisionous snakes and the Florida Pet...Aligator. The Mosquitos are out day and night and quite ofen swarm at night, just opening the door to your car can bring in countless dozens of them in a matter of 5-6 seconds in the summer. Horribly hot and humid in the summer with severe storms almost daily during the summer months. You need to be a special person to want to live out there out of choice, consider it the wild west of Florida.
It's not a matter of race it just happens that there is a large minority population out there, actually makes them the MAJORITY so it's not race. It's just the land, it's very difficult life out there on Florida's last fronteer so it's poor and with poverty comes violence. Don't worry the rest of the country is becoming just as poor now, the violence will come to you too sooner than later.

No state, community or person will escape this thing people call the recession which is BS, we are headed for a DEPRESSION if not already in one. Washington is just afraid of saying the "D" word in public for fear of the panic it will create and most of us are just stupid not to know on our own that it is here. Watch the news if you don't see it tonight you will see it tomorow night, violence is increasing EVERYWHERE!