We used to draw stuff like that all the time in grammar school. The nuns would whack us in the back of the head and take it away if they caught us doodling instead of paying attention. Heck, a picture showing a lot more weaponry than that and even a lot of violence would not even get a call home to your parents back them. Look at schools now, for something like this a kid would probably be both expelled and arrested.
Maybe the time for a revolution is not so much nigh at hand but was missed decades ago when we first started to allow extremist liberal snowflake teachers and politicians rule our lives and our children's lives.
All the best,