In 1994, after a series of mass shootings, Congress banned many assault weapons. A decade later, the ban expired, and these firearms flooded the market. According to the Wall Street Journal, before 1994 there were an estimated four hundred thousand AR-15s in the U.S.; today, there are twenty million AR-15s or similar weapons.
The New Yorker does a deep dive into the Kyle Rittenhouse shooting and how a troubled, bullied kid made a colossal series of mistakes and was co-opted by a whole slew of opportunists eager to exploit his situation. Nobody comes out OK in this story.