It's not just a thing concerning the blacks vs the whites. When it comes to islam it also has to do with the allure of a foreign culture that rejects almost all or as many things western as it can. Growing up in the USA or in a western christian culture is not satisfying to many and islam may have provided the answers he was looking for. Osama Bin Laden and Al-Qaida's greatest strength do not lie in the bombs or bullets it can throw or shoot, but in it's ability to inspire and draw others to it that are willing to carry out those attacks.
Nidal Hassan
Jose Padilla,
Adam Ghadan
An arab american, a Puerto Rican and a regular middle class white guy. These guys we're inspired by the message and felt it their duty or feel it is their duty to carry out jihad-harb against infidels. Islamic beliefs could hold sway in DR if an islamic charity comes in building homes, free health care and offering other incentives such as sending the students to study abroad.
I'm not saying it will but it could. This guy Almonte probably was disconnected from his Dominican culture, then again maybe he wasn't and he liked bachata and ate mangu. However he decided that following the prophet of islam and practicing violence was the better option for him. Point is a muslim could be anyone and they could be anywhere, not trying to be sinister either, just saying don't confine it to black vs white, because it's much more complex.