How the "world" will take care of offending people if no one will report to the "world" about offending people's actions???? Does "world" will automatically know the actions of offending people to take care of them?? Like an alien's status cannot be adjusted automatically by virtue of him/her to be merely married with a US citizen. Until both parties file paper with USCIS, USCIS doesn't automatically hand out a legal status to alien-spouse. Similarly, offending people's actions must be reported in order to expect any kind of action or to see being taking care of.
Secondly, this is not about forgiveness, ideals, matter of personal choice; instead it's about doing the right thing. OP's wife has tricked the OP, if this is right as per his story, then her actions must be reported to USCIS. Whether USCIS will revoke her green card or not..it's between her and USCIS, but by reporting her actions OP will do the right things. The problem is- these kinds of crimes and immigration frauds go on and encourag others to do the same because of people who talk about forgiveness and moving on as if nothing was happened and everything would be "lovey-dovey". That's the sole reason US govt. don't pursue on this kinds of allegations/reporting because people don't come forward with it as much as they should have been. Again, it's about right and wrong than anything else.
If I would see someone kidnapping a child in my neighbor in front of me or robbing a bank in front of me, I would not only try to stop it all this happenning but also report those activities to the law enforcement to bring the offender to the justice than just let the offender kidnap the baby or rob the bank in the name of forgiveness, ideals, moving on. Yeah, some may say that immigration frauds are not crime but can they tell me how come they are not?? Crime is crime, and every good citizen (legal or ilegal) has an obligation to report it regardless of their ideals and personal choice. Forgiving, moving on, ideals and not reporting the crime and criminals won't help society, victims nor it helps in stopping the crime.