I get what you're saying OP but you're message needs clarification...
All large cities, including Boston certainly, have issues with black crime. But Boston is one of the safest large cities in the nation so that is a huge plus to be really safe with a LARGE black population...
I've been to Boston once and really enjoyed it. I couldn't live there though, I have no family there and I'm not built for the winters...
So where is Boston down south, defined for me as large black populations that are among the safest cities nationally? Raleigh, where I currently live, and Virginia Beach, where I lived previously and hope to return to eventually...
It is different living in cities with big black populations that aren't overrun with violence. In both VB and Rgh these are cities where black wages, black wealth and black jobs are competitive and higher than national average, so is black educational attainment. The areas that are impoverished and/or violent are similar to anywhere else, there are just fewer of these areas in Rgh and VB...
If you live in cities with high rates of violence and shyt, you learn how to function within that, its normal. It's different living in cities that aren't like that because they are the exceptions to the rule. And I get why people with no ties to Boston or Raleigh or Virginia Beach would be hesitant to live there, but for me, now that I've lived in this kind of city, I don't know that I can go back despite my love for various places I've lived that have substantially higher black crime and poverty (Sacramento, Los Angeles, Richmond, Charlotte are four cities I love tremendously I lived in but it isn't the same as living in Rgh or The Beach)...
Also OP stop generalizing "down south racism"

. Racism has a different look in some places but it's all the same at the core, the intent on limiting opportunity for black folk. VB also had subtle racism, so too does Rgh I guess. There aren't lines of Klansmen running the streets but there is definitely racism anywhere you go in this country. If you can deal with Boston racism, which is one of the more notorious racist cities nationwide, you could deal with Beach or Raleigh or anywhere down south racism...