I’m not sure who the audience for this is, kids or adults.

You might try looking at the site linked in the video description…
cft.org

After you watch this video, click here to share with friends, and send an email to your elected officials to let them know they need to restore higher federal tax rates on the wealthy so that we may once more enjoy properly funded public services.

So the intended audience is anyone to whom it gets spread via the internet as you just did here. The teachers union is looking for support from the public at large, they are not trying to indoctrinate children with this.

While I agree that the cartoon is a very simplified and one sided view of the financial crash I have to ask what it is you really expect from a cartoon? We all know that towers of money really didn’t fall on peoples homes and crush them, it is called comedic hyperbole, not a lie. Personally I think the overall gist of the message in the cartoon is much more right than it is wrong as far as it concerns low tax levels on the wealthy and their paid political supporters.