Kyle RittenhouseSipa USA via AP

Gun rights activist Kyle Rittenhouse wants you to know that he’s very pleased with the Supreme Court, after the justices on Friday overturned a federal ban on bump stocks—devices that are attached to semi-automatic firearms to make them shoot as quickly as machine guns.

Bump stocks were banned under the Trump administration with bipartisan support after a shooter in Las Vegas used one to spray more than 1,000 rounds into a crowd at a concert, murdering 60 people and injuring hundreds more. As gun control groups and families of mass shooting victims mourned the Supreme Court’s decision on Friday, the 21-year-old Rittenhouse went online to share his own........

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