Fear drives opposition to gun control - CNN.com
Frum seems really certain that it is fear.
In the last 10 years motorcycle sales have skyrocketed http://www.bts.gov/publications/special_reports_and_issue_briefs/special_report/2009_05_14/html/entire.html
The biggest growth area is riders over 50. Since I've bought both an assault rifle and a motorcycle in the last 10 years, and Frum points out that this group is also the biggest gun purchasers, perhaps he is missing a factor or two?
I'm going to go out on a limb here and say that people over 50 are aware that motorcycles are dangerous. Even the many that ride without a helmet are aware that motorcycles are dangerous.
Somewhere around 50 it becomes clear that one is not going to live forever, and in fact, your time to do things you might like to do in life is far more limited than mere age of death demographics would suggest. As parents and others age and pass on, it becomes very clear that your quality of life for the last decade or two of your potential life span is likely to be much less than you are used to and might have hoped for.
Guns go bang. Some of them go bang a lot of times. Being able to keep them on a target at all can be challenging -- when it gets less challenging just add more targets, time the firing, put the targets farther away, make them smaller ... you get the idea.
Guns are male jewelry. Especially handguns. They are a combination of beauty and power, yes, with some danger mixed in. (See motorcycles). Guys like Frum and a lot of others that "know better" don't like them and want them banned. There are a lot of folks that have a lot of similar ideas about motorcycles.
Sauce for the goose. You may or may not have had some rebellious tendencies when you were a teen, but by the time you are 50 the idea of some supposedly brilliant somebody having power over your choices is completely different. When you are 20, you are likely to do something just because someone says you can't ... or even just because someone else (eg your parents) does or doesn't.
After 50 years, you have no doubt spent a lot of time making or being forced to make choices on the basis of things like "gotta raise the kids", "gotta keep a job", "wife won't let me" (maybe for some of those reasons), "no time, too much work, kid raising, etc... ". Some of those very real considerations start to lift in the 50s and you realize you can reasonably make some different choices ... and that the time when you can is not likely to last a whole lot longer.
You have also seen the clay feet of the "elite". Like all people, while they are telling you what to do, it turns out they have their own problems --- wine, women, weight, gambling, smoking, drugs, ... the list is long. Likely you yourself have wrestled with one or more tendencies, maybe you still are and always will be. "The brilliance of man" often tends to fade somewhat as age advances. Turns out that none of us are nearly as smart as we once thought we were.
Twist the throttle, pull the trigger -- as long as you are still breathing, life can go on, and guys like Frum? Well, they can still get their jollies still being certain that they have the world all figured out.