Do you think "affluenza"[1] was a worthy defence and justified not holding the person in Texas who killed people while drunk driving accountable?
Also, how does your assertion that poverty among blacks is the main if not sole cause of their elevated murder rates square with the fact that the murder rates among impoverished whites is not comparable?
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[0]It is also unfortunate and misguided to place responsibility and thus responsibility to solve the problem solely on outside groups. What outside group or society should we blame for the relatively materially impoverished state of some Australian Aborigine, Papua New Guinean, Sub-Saharan African, and American Indian groups that was discovered upon their first contact with other groups? Some people just live in different ways, owing in part to the selection pressure of the environments they evolved in over many years, there's no reason to blame anyone for that.
The fact that some of these difference in crime rates can be explained by factors such as poverty, doesn't change the fact that on encountering a Black person, a White person is in more danger than encountering a White person.
In fact, poverty alone does not explain the crime rate gap. You can call this view "hugely racist" but I don't see how you can rule out a whole set of other causes a priori. And I'm not mainly referring to genetics, but rather other sociological causes as are discussed in[0].
[0] https://en.wikipedia.org/wiki/Race_and_crime_in_the_United_S...