How many of "these people" do you know? I have a LOT of friends that would be considered liberal that live in the areas you're talking about. Their views on guns range from "don't give a **** either way" to "please help me pick out a gun and teach me how to use it". The majority of them are not naive to their surroundings and still have a sense of self preservation. Even the oblivious ones don't care either way.
There's not much political activism in New Orleans on either side of the fence. Most people just wanna party and do their thing and could care less about what other people do.
I'm with speed on this. I'm not far displaced from college (albeit, LSU) and while I do know a handful of far-left leaning folks who wouldn't give up on the fight, many of the hipster/yuppie/urban gentrification types:
a) Don't care either way
b) Are aware of the situation (and locale) they are in and appreciate the need to protect themselves
c) Despite living in urban centers, they like to tout a sense of self-sufficiency and given the opportunity would go hunting with you
I know a lot of long-haired, plaid-wearing, tree-hugging dudes you'd immediately dismiss as hipsters that have shotguns propped up in their closet and hunt the **** out of some ducks. Hell, I wear thick-framed glasses and plaid shirts sometimes...I pass on the skinny jeans though.
On top of that, aren't they only displacing the pre-existing liberals and in far less quantities?