I think that people are people wherever you are. I think that extremism is to do with a combination of miseducation or very poor education, the individual having unresolved trauma and so having uncontrolled feelings which are misdirected, and usually manipulation by third party.
I think manipulation is up by a billion percent at the moment though why I couldn't say, especially in relation to young people teenagers and in their twenties. I also think that the level of trauma is up in young people because of changes in what they read, their role models, the internet, video games. It is a pretty toxic mix, pretty scary really. And having a black market now flooded with weapons is not going to help.
A BBC report a couple of years ago noticed that extremism or domestic terrorism was on the up and it was thought that teenagers at school were the main targets for manipulation - but no conclusion was made about who was behind all the manipulation or its motivation. Though maybe it is the white elephant in the room.
In several parts of the world now and in the past it has been alleged that 2 different ethnic groups have been manipulated so that they hate each other or one deeply hates the other, meaning that violence and destruction is inevitable.
I think that children who are brought up without a high level of trauma or who are helped to process are unlikely to jump on the extremism bandwagon but it seems almost trendy at the moment to be hands off, not "helicopter", meaning that a lot of kids are wide open to manipulation.
I'd be interested to know what you have seen, OP, which has led you to post this, even if you do not want to name the ethnicities involved.