I'm with OldTrees on this one. In addition to his point, people can choose to neglect to do the "right" thing, which would, in essence, be doing the wrong thing. For example, if a person sees a man choking in a restaurant and does not know how to help, but believes that the right thing to do is to try to help people in urgent need, it would be wrong not to help. However, the person's ego is telling them not to help for many reasons (not qualified to help, someone else would do it better, don't want to draw attention to oneself, etc.). The person must make a choice - to help or not to help. Not helping is not only wrong in this case, it is easier than helping, and is fairly likely to happen as a result.
If the person knows that helping will be the best effort they will. If they suspect trying to help will cause more issues than not doing so they won't. Right and Wrong have nothing to do with that.
If the person dies because they did not help and they question the result that the risk may have been worth taking then they may now feel what happened was wrong but at the time the decision was made they chose not to because they thought it was right to do so.
The same is with the thief above. If he steals he may no it is against the law, but the law may not be right to him. Why should such traditions be against the need to aquire. The aquisition may be of need physically or need mentally but in either case it is a judgement of the result before seeing the result and choosing to do the act is seeing it as right at that time.
Stealing money using violence from a bank will be right to a robber. He sees any action that will come to course as insignificant to what he is about to do and the result will be beneficial in a way. Now after the fact he may enjoy the money, it was still right. Its only after he is persecuted for his actions will he call his act wrong and that is because the result is now no longer as desired.
Why do you move a piece in chess? do you ever do it because it is wrong? or is it only after you see a result you had not predicted do you consider the move wrong?
The same occurs in life. You make descision based on the information you have at hand. If the sum of that information is right you do the action, if wrong you don't. Never does anyone knowingly do wrong. Note that this is not the same as questionable or illegal. Those terms mean something totally different.
Socrates is right "Man does not knowingly er or do wrong"
Edit - After reading this I also had to add another section to it. Firstly right and wrong are perceptions based on experience. You can share your opinions of right and wrong and maybe that shared experience will affect my view but the resulting knowledge of right and wrong belongs to the person making the choice. You can say I am wrong, but regardless of that I can know from the information at hand I am right.
A person steals to feed his family is right because from what he knows it is the best action. A person who is an authoritarian will follow the law and say his actions are wrong and may even let his family die as a result. You can question the actions taken but only they know what is right.