My guess is the artist had no idea what a “Saturday Night Special” is. And I’m certain they didn’t know the origin of the phrase (“Ni**ertown Saturday Night Special”) and how the legal restrictions on them came about (to disarm poor blacks).
And what about the “School Day Shooters”? Did the artist really believe people advocate shooting school children? I think some pretty bad things of the anti-gun people but I am of the opinion that most of them actually have good intentions (reduction of criminal violence). But there are so many anti-gun people who seem to actually believe the pro-freedom people intend the destruction of innocent life. I suppose it’s possible they don’t actually believe their own rhetoric. They could be just telling the big lie again and again in hope others will believe it.
But I think the most likely explanation is that they haven’t put any thought into it. So many times when I have asked some anti-gun person just one or two questions they get this blank look on their face. It’s a “deer in the headlights” look. Or perhaps a better metaphor would be that it is as if they were the Emperor who just realized they were totally without clothes.