Greta is a poor example.
The child has several mental disorders (yes, her parents discussed the topic on a European TV show). Indoctrinated by her parents for years, she is their mouthpiece, their tool.
You rarely ever see complete clips of her interacting with others. She speaks with fury and passion…right up to the moment she reaches the end of her prepared speeches. When questioned on even the most basic facts she flounders and balks, and reverts to formulaic factoids that may or may not be relevant to the question.
Her parents are horrible people, akin to show business parents who market their children to Hollywood.
When the children of conservatives speak out the left accuses the parents of exploitation and brainwashing. When Greta speaks they fawn and slobber over the wisdom of youth.