If you are a parent, would you be against software that monitors your children's activities?

I am not a parent, but I do remember all the ways I circumvented my parents because of their lack of technical knowledge. I am not against writing a keylogger for my children’s computers, or a system process recorder, locking the bios, etc etc. My goal is to catch misbehavior and point out why it can be detrimental, not to prevent them from exploring. Overboard, or no?