I didn't say that, you plonker.
I said that if you're from a "bad" postcode, your ability to
use your social capital is affected and limited, just as it is by where you were born, what accent you speak with, loads of stuff.
That doesn't mean that you can't be from or build a strong community. It
does mean that your community will very likely have suffered
more from the effects of overt and covert policies to break class solidarities, though, than a community in a "good" postcode.
They don't have to, they have access to networks that make it easy for them to "spend" any social capital they need to.