It can be both. I worked briefly in youth work and young offender institutes. Some young people were simultaneously fucking terrifying and dangerous, while also wheeling and dealing like a Kray twin crossed with Del Boy (a 12 year old kid who carried 5 mobile phones - all stolen - for different “business purposes” comes to my mind).
Doesn’t mean they aren’t victims as well and doesn’t mean they should be treated as adult criminals.
I don’t particularly care about the most granular definition of “terrorism” in the context of the wide definition of “child abuse”.