What do you think about denouncing other people to the authorities?
It is according to you is the difference between a good denunciation and malicious denunciation.
For exemple i was spanked once maybe two in my entire live, and each time i was spanked for good reason.
While on other hand my best friend got spanked by his abusive step dad almost every day.
Now spanking is prohibited by law in Poland, once i read article about one mom who spanked her son for misbehaving on street, One neighbor called the police, and this woman had by this unpleasantness, then asked the man why he called the police, said that there is nothing to corporal punishment, that the kid was spoiled brat and he would spank to if he was his son, that he just does not like his neighbor 
The other thing i read about a guy who reported his rich a businessman, neighbor to US (Urząd Skarbowy - The Tax Office) government agency that collect tax, and court imposed fines, every Pole is required to fill up yearly tax declaration there, one guy reported own rich neighbor to The Tax Office, barbecue thoughts he cheat on tax because he was to rich in his opinion, the Revenue Officers need to check it, and they find that they guy not cheat, that he was genuine law abiding businessman
I wonder how many how many denunciations is only envy or malice?