They noted that many of Collier's conclusions were unsupported by research, and concluded as follows: "Collier laments the fact that the immigration debate has been marked by “high emotion and little knowledge.”
De menade att många av Colliers slutsatser inte stöds av forskning och konstaterade därför: ”Collier beklagar det faktum att invandringsdebatten har präglats av ’mycket känsla och lite kunskap’.