Why:
1- These dictatorships don't like guns sold in US market to leak to their countries.
2- Lots of these countries try to give this image to nation (especially parents) that they live in good country. When USA gun right give this message that right of bearing arm is a right that is taken from you, it destroy that image it create an expectation. It give this feeling that ordinary people are slaves of armed authorities.
3- And what if other western country adopt gun right
So they create these massacre, especially with teens victim to urge gun ban in USA.
How:
I have bullied in school so much. if had the address of those you bullied mevI would go for revenge. Even if I want to take a revenge and somehow if I wanted to take revenge from someone other than those bullies it would be school authorities or even if we should consider total illogicalness maybe others with age range of the bullies annoyed me but at current time. But those who want gun ban prefer child victim.
They found a young person stuck in mental institute give him a freedom way (suicide way). He should obey them, otherwise he should come back to that hell hole.
For family story paying money to them can fix that. already get rid of that child by putting him in an institute so buying them so buying them will not be hard. If don't accept it they threaten to keep their mouth shout. But They usually select someone without family
Notes:
I saw some psychologist that wasn't aware of troll farm existence and was offering psychologist analysis for these farms' member activity. Definitely psychology is still a pseudoscience.