The email teaser from Springfield is titled, "HOW ANTI (AND PRO) GUNNERS BOTH UNDERMINE YOUR RIGHTS," but the article doesn't really address how pro-2A people undermine our rights.
The thought that comes to mind is: ignorance, and toxic tacti-bros who are out looking for a fight. An article posted here a few years ago took apart the self defense argument of an alleged road rage victim who, after defending himself successfully with his firearm from significant bodily harm after a vehicular assault, proceeded to execute at point blank range his attacker who was lying on the ground, posing no legitimate continued threat. These are the cases where pro-2A people undermine our rights, because, aside from mass shooters who are all mentally ill, they are the example held up by the anti-gun movement as to why there is no such thing as "a good guy with a gun."