Wishing Americans a happy Father’s Day, the White House tweeted a picture of President Obama and one of his daughters playing with toy water pistols. The Tweet comes at a time when several schools around the country—fearful that such toys make kids more prone to violent behavior—have launched trade-in programs that encourage children to exchange their harmless toy guns for chances to win prizes, like books and bicycles. One such trade-in took place last weekend at Strobridge Elementary in California. Principal Chris Hill, who organized the event, explained that toy guns desensitize kids toward gun violence.