I don't think it is a theory. We have now decades of documented reports that Russia is targeting the USA sowing social discord. They don't care about any specific outlook, they will support both extreme right and extreme left as long as there is social conflict and polarization.
Kids should be learning about these things at school, they need to recognize attempts at polarizing, creating conflict, and make them perceive other members of their own society as enemies. Both young and older people are vulnerable as these "trolls" (which is not an appropriate name any longer btw) use some real social problems as a starting point and escalate them. And they're extremely successful in part because of social media apps algorithms that effectively act as amplifiers of extreme content.
Kids should be learning about these things at school, they need to recognize attempts at polarizing, creating conflict, and make them perceive other members of their own society as enemies. Both young and older people are vulnerable as these "trolls" (which is not an appropriate name any longer btw) use some real social problems as a starting point and escalate them. And they're extremely successful in part because of social media apps algorithms that effectively act as amplifiers of extreme content.