At some point in a debate on "gun control," the anti will run out of any logical argument. ("Logical" by their precepts.)  None of their arguments can be supported by any objective criteria, and eventually, they'll be forced to face this.  Since facing reality is anathema to the truly insane, they will then inevitably resort to name calling, ad hominem, and childish insults:

Responses to allegations that gun owners have small penises:

Is it "liberal" to mock someone's physical traits?

Do you believe all police, federal agents and soldiers have small penises? What is the statistical likelihood of this hypothesis?

Given that Asians have smaller penises than those with African ancestry, how does your hypothesis match the relevant firearm crime rates between the two groups?

Women don't generally have penises. What are females compensating for?

If someone were compensating for a small penis, would that be relevant, if they were not committing any harm?

You seem to spend a lot of time worrying about penises. Is there anything you'd like to tell us?

Are you completely out of logical arguments, so dick jokes are your only retort?

My penis satisfies me completely.  And I can't imagine wanting sex with a gun.

http://www.huffingtonpost.com/2013/09/19/penis-map_n_3953318.html Perhaps it's American liberals who are worried about their penis size.  Quite seriously. I thought I was high average, at the top of mean, but apparently I just barely break into the second deviation above the mean. Thanks for that confirmation.  I feel more awesome than ever.

Kafkatrap.  If I respond with proof or attempt to argue, you'll accuse me of being worried about my penis.  If I ignore you, you'll childishly continue with the dick jokes until you get a response. 

So, if your house is invaded, you plan to fuck the intruder to death?

I have a ruler, a camera, and $50.  Would you actually like to take this bet?  Or does the sour grapes metaphor apply here?

I'm sorry about your sexism, bigotry, prejudice against people, and your small penis.  Three of those aren't very liberal.