And still, this gives you or anyone no right to violate the privacy and endanger their rights. That just puts you on the same level as them, willingly destroying the lives of others because it brings you pleasure, because you believe it to be justice.
Regarding a), I recommend to examine the syntax "Other countries or, for example, the EU", which specifically does not refer to the EU as a country due to the occurence of the word "or".
Such behaviour is also certainly a crime in germany (§238 StGB and related Articles); if your actions cause someone to die or injury or the threat thereof, you can be prosecuted for it (though you need to actively sue either a specific person or against anonymous).
