Exploited: Suspecting that one of his minions will eventually join the good side, Emperor Evulz secretly implants a bomb within him. Not only it will get rid of him, but with perfect timing it might even kill all the heroes in the process.
Defied: "You think I'll stop just because it would save the life of my beloved? Hahahaha! That's funny!"
Conversed: "Well, whaddya know, the most sympathetic of the bad guys was redeemed."
Deconstructed: The bad guy switches sides and helps save the day... but rather than find redemption, friendship, love or even gratitude, he promptly goes to jail for all the crimes he's done. By the time he's released he's not hailed as a hero, but forgotten. Those who do know who he is treat him as a reject. Why did he switch sides again?
Reconstructed: The bad guy weighs the possibilities, realizes that changing sides is profoundly stupid... but still feels Even Evil Has Standards. So he'll help stop this bad guy, and go to jail.