I don't like guns, but if you have to go hunting you should at least know how to shoot straight.
Also note: the list of the war dead from recent World War I actions on the same page as the comic. The US had entered in April 1917. By September 1918, Germany's last great offensive had failed and the Allied Hundred Days Offensive was in progress; this would lead to the Armistice of 11 November 1918, and the Treaty of Versailles the following year. By that point over 20 million people will have died and about the same number wounded.
I really think gun licenses should have a similar process to driver's licenses. When I got my driver's license, I had to do 32 hours of classroom teaching, then 8 hours of student driving, and then pass a written and practical test. A gun license should be the same, or more stringent, and also require renewal through an office like the DMV every few years. And if the licensing instructor doesn't think you'll be a safe gun owner at the end of the test, then no license for you, go back to class and you can take the test again in 6 months.
I think this would be a lot more effective gun control than all the piecemeal regulations about various types or technical features of guns.
Not to mention the newsvertisement for a vegetable compound titled: "Woman Works 15 Hours a Day". "I get up in the morning at four o'clock, do my housework, then go to a factory and work all day, come home and get supper and feel good"!