On this week’s depressingly familiar weekly Independent comics page: The Parkland, Fla., school shooting is on the minds of most of our cartoonists, as Jen Sorenson examines the NRA’s Safe School of the Future; This Modern World looks at a similar tragedy on an alien world; and Apoca Clips deals with a weapon in the salon. Meanwhile: The K Chronicles makes magnetic poetry; and Red Meat rejects silk boxer shorts.