Who is this "we" of whom you speak? Do you really not understand that Republicans aren't necessarily friends of the 2nd Amendment and not all gun owners are Republicans?
I'd also love to hear more about this "hetero-bigotry" you seem so invested in oppposing.
It may surprise you to learn that academics tend to have specific areas of interest into which they focus their research. Any arbitrary academic's corpus is likely to show similiar specialization.
That and they know journals eat up anti-gun studies so it's an easy way to get even sub-par research published.