1- Two wrongs do not make it rightStasi was trying to defend its country and the achievements of the workers class.
What do u Say about today surveillance and Psycho warfare in the west ?
2- Stasi took it to the absolute extreme by pitting families, neighbors, employees against each other. They broke into people's homes and stole their stuff or messed up their furniture, did whatever possible to drive the population towards complete insanity because if they're busy telling on each other with a damaged mental health they won't rebel against the state. All in the name of the collective good and fighting imperialism.