Not much spreads fear and bigotry faster than a public official intent on playing the politics of division. On Thursday, Representative Peter King, the chairman of the House Homeland Security Committee, is scheduled to open a series of hearings that seem designed to stoke fear against American Muslims. His refusal to tone down the provocation despite widespread opposition suggests that he is far more interested in exploiting ethnic misunderstanding than in trying to heal it.

Mr. King, a Republican whose district is centered in Nassau County on Long Island, says the hearings will examine the supposed radicalization of American Muslims. Al Qaeda is aggressively recruiting Muslims in this country, he says. He wants to investigate the terror group’s methods and what he claims is the eagerness of many young American Muslims to embrace it.

Notice that the hearing is solely about Muslims. It might be perfectly legitimate for the Homeland Security Committee to investigate violent radicalism in America among a wide variety of groups, but that doesn’t seem to be Mr. King’s real interest.