“Why are Americans so dumb?”/“Because they shoot the ones who go to school.”

A possibly politically incorrect joke on the subject of school shootings was posted on Reddit—MeanJokes on July 6, 2018:
   
Q: Why are Americans so dumb?
A: Because they shoot the ones who go to school.
 
The joke was posted on Reddit—Jokes on July 13, 2018.
 
“Summer means about three months of no school shootings” is a saying about school shootings.
 
   
Reddit—MeanJokes
Why are Americans so dumb? (self.MeanJokes)
submitted July 6, 2018 by Stampsvsflames=
Because they shoot the ones who go to school
 
Reddit—Jokes
Why are Americans so dumb?
submitted July 13, 2018 by BraySC
Because they shoot the ones that go to school
 
Twitter
Brata George
@BrataGeorge
Why are Americans so dumb? Because they shoot the ones that go to school #smile #reddit #jokes
9:41 AM - 13 Jul 2018
 
Twitter
Mr. Drinks On Me #FRA 🇫🇷
@Mr_DrinksOnMe
Why are Americans so dumb?
Because they shoot the ones that go to school.
8:07 PM - 13 Jul 2018
 
Twitter
RedditJokeOfTheDay
@Sunnynagam
Daily Reddit Joke:
Why are Americans so dumb?
Because they shoot the ones that go to school
6:01 AM - 14 Jul 2018