Two things:
1. AP is a perfect example of the failures of urban revitalization.  Make a small part of a town/city nice for visitors and businesses and let the other parts of town rot away (e.g., AC, JC, and Newark).  There are no nice parts of Camden, so I won't cite that as an example.
		
		
	 
Not sure what your solution is. So places like AP and Jersey City that have some really great areas and really bad areas.
1. Don't revitalize any part of town? You do realize the parts that were revitalized in both had high enough real estate values to attract investors.
2. Are you suggesting the towns just eminent domain the bad areas for development and ship the hundreds of thousands of people to Camden or somewhere else. Obviously I am being sarcastic, but where do you think the people are going to go.
3. You do realize no town has enough money to buy out enough property in poor areas to make a difference. It is not their intention to let the poor areas "rot" as you say, they don't have as much control over private property as you think they do.
Everybody is quick to criticize revitalization, but don't understand the challenges of revitalizing the poor areas which cannot attract enough investors to make a difference. It takes a long time, and progress is very slow, but it is happening in both areas as construction and revitalization is moving west in both towns.