Top rental markets are also the most dangerous cities?

[Wayne Tam]

Just came across this list of most dangerous cities in America: Forbes 10 Most Dangerous US Cities and to my surprise many of the top rental markets spoke of by the other members are on the list!  Detroit, St Louis, Memphis, Birmingham, Atlanta, Baltimore....is this why the saying higher risk=higher return?  I've been reading on investing in Memphis and now I'm not sure if that's a good idea....can investors from these areas please chip in?