WASHINGTON, D.C. — Outside the U.S. Supreme Court, speakers blared with the frantic strums of guitars and the voices of four young men singing gospel songs — rock and roll style. Donning shaggy beards and seated on a makeshift stage, the four were among thousands of pro-life Christian activists protesting the 37th anniversary of Roe v. Wade, the 1973 Supreme Court ruling that legalized abortion. Out on the streets, a small band of Yale students led a different chant. Glory, glory, hallelujah! In the beauty of the lilies, Christ was born across the sea,” the Yalies’ voices sang in harmony,...