A magazine is one of those things you stick in an “assualt rifle”. If it is “high capacity” it is evil. The definition of high capacity is constantly revised downward, the ultimate goal is to make anything over one round an illegal high capacity magazine.
Charles Krauthammer wrote an article about it in the 90's and called it "defining deviancy up" (for you -- minutiae become huge, huge outrages if you do it). (Example: all the "daddy is a secret monster" movies, and further examples Sleeping with the Enemy, The Glass House, and Tombstone ["Ah'm from TEX-usss! <audience hisses>"]).
It was a companion piece to Daniel Patrick Moynihan's coinage, "defining deviancy down", by which he meant the game The New York Times was playing then, of soft-pedaling the crimes of perverts and other disfavored groups (i.e., favored by NYT editors and publishers) and redefining large perversions as piffling little faux pas. This was a necessary first step to rounding on middle-class America and demonizing us.