Gun magazines are not the same as Joe Darkhair with his laptop having gun logos and such on his creen.
I can see exactly how a tenderfoot citizen amongst the public might see this and become alarmed.
An easy enough thing to explain away it is.
When I'm flying and seated in public zones I'll go into the sites control panel and disable display of images. Additionally I'll be sure to scroll my page down enough so as to not show the site banner graphic if it features a firearm.
Or as noted pickup a privacy screen for your laptop.
Welcome to 21st century Amerikkka