I found this a very interesting cultural view of issues...
Just to expand a little, the NRA was founded because the Jim Crow Laws, enacted by Northern Democrats who were prejudiced against Blacks, tried to forbid the former slaves from owning fire arms. Their goal was to help fight for the rights of ALL free men to own fire arms, and to help teach them how to use them to fend off attacks from the likes of the KKK...There are some pretty insightful comments in this video but also a lot of misconception about the NRA, its history and just fact in general (e.g. the guy said that NRA is essentially a legalized KKK implying that KKK is illegal when in fact it's not). Most of that seem to be rooted in non-gun owners irrational fear of guns but I suspect there are some political biased involved as well; Republicans are pro-gun Democrats are anti-gun etc.
And then I think there are some black people out there (and some in the video) who think that if an organization isn't headed by a black leader or at least represented by a good numbers of blacks and isn't actively promoting black interest or black "equality" then that's an inherently racist organization especially when one that is predominately white i.e. US government, certain police departments.