K3n:
Here are my thoughts on your question 1 above ...
I kind of don't get it, either.
From my understanding, they aren't anti-black ... They will work with other gangs that are black, but they do not have any black members within their own gang. But, Chib's wife / ex-wife is black. So, I kind of don't get the angle they are going with Juice & the cop - unless it's another red herring type storyline to throw us off (like the end of season 3 thinking Jax was working alone with Stahl). What really doesn't make sense to me is that they know Juice (and Happy) are Hispanic, so what's the difference ...
Apparently, Kurt Sutter has blogged about it (I didn't read his blog, just another post on another forum that talked about it) where he said there's sort of an unwritten rule about segregation and motorcycle 'clubs.' (but, again, that doesn't explain that they are ok if he is hispanic, but not black). He said that the clubs with work with other races, but they don't intermingle and that the situation will be explained better as the season goes on
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