The son of an undercover thug (who lied to his mother) supports the "spycops" campaign and hopes it will pressure the thug department to tell him something about his father.

Please don't think that your own identity depends crucially on who your parents were or what they did. Their actions surely affected you, just as their genes did (in the usual case), but you are not responsible for them and they don't define you. It wasn't you that did them. You might regret those actions, appreciate them, reproach them, or admire them, but you never have a moral reason to feel ashamed of them.