I am not sure what OP wants to say with this submission... Is it that the US treats differently people who defect to them than people who defect from them? That's... not very surprising. In some way it feels more fair than the way the Soviets treated Kim Philby, a British spy and defector: http://en.wikipedia.org/wiki/Kim_Philby (tl;dr: he wasn't a KGB colonel like he was promised, he was kept essentially in house arrest, and had a 500 rubel allowance).

As for Kukliński, being a Pole myself, I have mixed feelings. I very much prefer that my country is in the American sphere of influence (and not the Soviet as it used to for almost 50 years). However, if WW3 had happened, we would've been be on the Soviet side. Zbigniew Brzeziński said that Kuklinski’s information had permitted them to make counterplans to disrupt command-and-control facilities rather than only relying on a massive counterattack on forward positions, which would have hit Poland. However, I have no dellusions that anybody in the US would have any doubts about turning Poland into a radioactive wasteland if that served the American interests of the moment...

Also, the Polish government after the fall of Communism wasn't very eager to pardon Kukliński. That happened only after Clinton's administration threatened to block Poland's NATO accession if he weren't exonerated.