They way I read it is that the changing habitat will hurt the polar bear (now click here to see polar bear starving because it can't find food due to ice melting).

The data does not YET bear(no pun intended) this out and alluding to a viral video is a sympathy play and not anything backed in reality but rather speculation and prognostication.

So by its very nature its propaganda since it's using misleading information to put forward a point of view as absolute truth.

Misleading tactics will always hurt your argument in the long run.