>It's interesting to see how some factions are now claiming that Greta is merely a puppet, following some hidden power's agenda

Please. She's a 16 year old child with no evidence of any particularly exemplary understanding of climate change or its impact on the world. She clearly has support from people with deep pockets, and the fact that they've chosen an approximately average child to deliver this message shows that they're elevating appeal to pathos over logos. You may agree with what she's advocating for, but that doesn't change the fact that this is literally propaganda, and choosing such a condescending messenger is going to turn off a lot of the people whose minds you're trying to change - and rightly so, I don't think adults should allow themselves to be shamed by children into making decisions.