Dear Catholics, if you're leaving the Hallow app because Peter Thiel was an early investor, I hope you'll also denounce Michelangelo, Botticelli, Leonardo da Vinci, and others for accepting money from the notoriously corrupt Medici family. Boycott St. Peter's Basilica while you're at it. But no one will. Because purity spirals are irrational, and they make people stupid.