1) your link does not provide adequate information stating where the highest concentration of these motorcycles is located. i do not believe it's in brooklyn.
2) the price of one of these motorcycles can be thousands of dollars, with several models exceeding a sticker price of 10k.
based on the limited information you've given, it's actually more likely that people who have the assets to afford buying those motorcycles would be the ones with higher rates of accidents, because they are the ones more likely to be riding them. the link that you've provided regarding race and motorcycle accidents is interesting, but largely counterproductive to your argument. according to that article, though blacks are more likely to DIE in accidents, there are more white people actually riding motorcycles. secondly, and perhaps most detrimental to your argument of risk taking behavior, is this fact:
"Crude helmet use among black motorcyclists was 79.1%,
compared with 77.3% for whites. When adjusting for age,
sex, insurance status, and year of admission, blacks were
found to have a higher odds (OR, 1.3; 95% CI, 1.19–1.43)of wearing a helmet than their white counterparts"
lastly, the wrap up of the article makes the point i'd like to stress.
"It is not clear why blacks are more likely to die after a
MC... First, it is
possible that the mechanisms that underlie other racial disparities in health outcomes—lack of insurance, reduced
access to care, poorer quality of care, greater comorbidi-
ties—are likely at play here."
if you want to argue lack of access to healthcare or insurance, fine. but please don't argue that people of color die because of their own reckless behavior and need to be saved from themselves. its both racist and classist.