First of all you will probably find my background interesting: Having a bachelor in Political Science and a master in Political Communication I have worked with public relations and lobbyism from inside the system and know how rotten it can seem to be. I see Thrive as handling very relevant subjects - but with the use of very well known PR/propaganda-techniques as e.g. used during World War II.
I'm a big critic of the current economic world order and see a high regulation of the top banks as very necessary step to ever get rid of the huge gaps in human inequality. Therefore this movie was very interesting to me. But Gamble definitely manipulates the viewer just like the 'enemy' he is accusing.
Thrive connects a lot of very different an very complex subjects by simply putting them next to each other in sequence without using much time to explain thoroughly and scientifically the coherence – exactly how Hitler (or Goebbels) always used to put rats and Jews together, making a powerful mental tool to manipulate people's minds.
Notice how he suddenly jumps from one conclusion about extremely complex problems to the other. Exactly like any other propagandist would do. When just using a couple of quotes of well-known persons as 'proof' and then jumps to the next, any university professor would flunk him had it been an exam. It's simply not scientific.
Now I could easily turn Thrive upside-down as a rich and powerful person's (Gamble) own attempt to create a movement much like a religious sect. Why? Think of the audience he addresses: People that believe in aliens. Just like small religious sects appeal to people that are easily convinced that their misery is because of some master evil dominating them. The classic 'us vs. them'-way of propagandizing as seen in any war and conflict.
Try watching a Youtube-clip about Scientology and see if you can spot any similarities in structure and layout? Misery vs. perfection: People suffering in a toxic wasteland, but by joining the movement you will see people smiling like crazy in beautiful natural surroundings. It's classic propaganda.
I would still recommend people to watch this movie since it makes you think and reflect upon important subjects that we tend to not think about. But put on your 'critical glasses' because Gamble might as well attempt to use the viewer to become his follower and visit his website and in some way supplying Gamble with money.
By writing this I also used argumentation based on propaganda-techniques. My point is: Always be critical of what you see and read.