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What makes you think this sub-population owns massively more guns in the US?Research. For instance, Holland has the lowest gun ownership in Western Europe (1.9%).[0]
In the US overall according to Pew, "blacks are only about half as likely as whites to have a firearm in their home (41% vs. 19%)".[1]
Among "secular urban bike riding pot tolerant gay tolerant coastal residents" in the US—let's call them "liberals"—23% of homes have at least one gun. According to the [Pew 2014] survey, "southerners are just about as likely as those living in the Midwest or the West to have a gun at home (38% vs. 35% and 34%, respectively)"[1], (with the exception of the NE, which is about 1/3 lower), so I think it's reasonable to assume that "coastal" liberals in, say, CA (where I live) are around that 20% mark. There's absolutely no way they are at 1.9% like Holland. Even if CA liberals owned guns just at 3.8%, that would still be twice what Holland has.
However, it's most likely that Holland-like people, culturally-speaking (liberal, pot/gay friendly, coastal, like bikes) in the US own guns at approx. a 7-10x greater rate than do people in Holland proper. There's also no dispute that the rate of violent crime is similar among these two populations. (As it turns out, Holland has a higher violent crime rate than other European countries with substantially higher gun ownership, suggesting that higher gun ownership in Europe might contribute to a reduction in violent crime.)
Regarding your suggestion that I'm a racist, I don't think violent crime is a white-black thing in the US (as you suggest), I think it's a cultural thing. Why? Well, if you treat blacks as one "race" from a stats perspective (i.e. if you're a racist), you get rather useless statistics. If instead you divide blacks up culturally—say, into "inner-city African Americans" and "recent immigrants from Africa" among others—you see very different crime statistics as well, i.e. it's not race—being black—that seems to be the controlling factor for violent crime, it's culture. That's why racism is so stupid: the stats just don't indicate that there even is such a thing as "the black race" that you can make meaningful aggregate statements like "violent crime" about.
So. If you treat the US with a broad brush when it comes to violent crime, it's very easy to come to the mistaken belief that "guns" are the problem, or even "a" problem—the stats indicate STRONGLY that guns are not a problem. Instead, cultural (not racial!) propensity towards violent crime is the problem.
That means that if we want to reduce violent crime, reducing gun ownership among "secular urban bike riding pot tolerant gay tolerant coastal residents" by 10x isn't going to make a difference—they're basically non-violent already.
[0] http://www.calgunlaws.com/myths-of-european-gun-laws/
[1] http://www.pewresearch.org/fact-tank/2014/07/15/the-demograp...