Hatchet Slayer Is Quoted as Blaming* lt;Debate Over Autos J11OKLAHOMA CITY, March 27—CB—Robert Cargo, 21, returned here early today from Birmingham, Ala., to face murder charges in the hatchet killing of A. L. Luke, Bethany flarist, was quoted by officers as saying he slew Luke after they quarreled over the merits of various makes of automobiles.County Attorney Lewis R. Morris, who was jn the party returning Cargo, said *«.he suspect told himen route:“We were talkig about the improvements on some cars and he (Luke! didn’t know what he was talking about and it made me mad. So I picked up the hatchet and hithim with it.’*Morris said Cargo admitted in aj signed confession that he robbed the florist after the slaying, which occurred March 7, and fled inT e ttfaKiId t a